How about:

    #Define the file name that will be deleted
    fn &lt;- &quot;foo.txt&quot;
    #Check its existence
    if (file.exists(fn)) {
      #Delete file if it exists
      file.remove(fn)
    }

As far as I know, this is a permanent, non-recoverable (i.e. not &quot;move to recycle bin&quot;) on all platforms ...


One of the reasons R cannot be safely exposed to outside users is that it offers complete access to system facilities. In addition to the `list.files`, `list.dirs` and the `file.remove` functions, the `system` function allows access to pretty much any exploit imaginable.

I want to change the height of my tableview from another viewcontroller based on the sum of its cells&#39; heights, as they are dynamic. Is it at all possible? Thanks

Add-on:

What I basically have is a UserProfileViewController that has a containerview on half of the screen. There I add different other viewcontrollers: 

![enter image description here][1]


![enter image description here][2]

In the case of the wall button this is how I add the viewcontroller and it&#39;s subsequent tableview:

    - (IBAction)wallButtonPressed:(id)sender
    {
        //Check if there is an instance of the viewcontroller we want to display. If not make one and set it&#39;s tableview frame to the container&#39;s view bounds
        if(!_userWallViewController) {
            self.userWallViewController = [[WallViewController alloc] init];
    //        self.userWallViewController.activityFeedTableView.frame = self.containerView.bounds;
    
        }
        
        [self.userWallViewController.containerView addSubview:self.userWallViewController.activityFeedTableView];
        //If the currentviewcontroller adn it&#39;s view are already added to the hierarchy remove them
        [self.currentViewController.view removeFromSuperview];
        [self.currentViewController removeFromParentViewController];
        
        //Add the desired viewcontroller to the currentviewcontroller
        self.currentViewController = self.userWallViewController;
        
        //Pass the data needed for the desired viewcontroller to it&#39;s instances
        self.userWallViewController.searchURLString = [NSString stringWithFormat:@&quot;event/user/%@/&quot;, self.userID];
        self.userWallViewController.sendCommentURLString = [NSString stringWithFormat:@&quot;event/message/%@&quot;, self.userID];
        
        [self.userWallViewController.activityFeedTableView reloadData];
        
        self.userWallViewController.totalCellHeight = ^(float totalCellHeight){
            
            self.scrollView.contentSize = CGSizeMake(320.0, totalCellHeight);
            CGRect newFrame = self.userWallViewController.containerView.frame;
            newFrame.size.height = totalCellHeight + 33.0;
            self.userWallViewController.containerView.frame = newFrame;
            
            self.userWallViewController.activityFeedTableView.frame = self.containerView.bounds;
        };
        
        //Add this containerview to the desired viewcontroller&#39;s containerView
        self.userWallViewController.containerView = self.containerView;
        
        
        //Add the needed viewcontroller and view to the parent viewcontroller and the containerview
        [self addChildViewController:self.userWallViewController];
        [self.containerView addSubview:self.userWallViewController.view];
        
        //CLEAN UP THE CONTAINER VIEW BY REMOVING THE PREVIOUS ADDED TABLE VIEWS
        [self.userFansViewController.userSimpleTableView removeFromSuperview];
        [self.fanOfViewController.userSimpleTableView removeFromSuperview];
        [self.userPublishedMovellaListViewController.gridView removeFromSuperview];
        
        [self.userPublishedMovellaListViewController removeFromParentViewController];
        
        self.userPublishedMovellaListViewController = nil;
    }

and in that viewcontroller this is where I initialize my tableview:

    -(UITableView *)activityFeedTableView
    {
        if (!_activityFeedTableView) {
            _activityFeedTableView = [[UITableView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 850.0) style:UITableViewStylePlain];
        }
        return _activityFeedTableView;
    }

I am calculating he total sum of the cell&#39;s height, the problem is that the cell&#39;s height method is called way after the getter of te tableview is called. So I would need some sort of way to know when the cells&#39; height method is done for all cells and then I can resize my tableview. Thanks


  [1]: http://i.stack.imgur.com/azqrZ.png
  [2]: http://i.stack.imgur.com/WC6kQ.png

Change UITableView height dynamically

I&#39;m trying to draw circle with the help of XML file in android, but circle is not displaying properly. Below code is showing Oval. How can I create circle in XML file.

    &lt;shape xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:shape=&quot;oval&quot;&gt; 
        &lt;gradient
            android:startColor=&quot;#FFFF0000&quot;
            android:endColor=&quot;#80FF00FF&quot;
            android:angle=&quot;45&quot;/&gt;
        &lt;padding android:left=&quot;2dp&quot;
            android:top=&quot;2dp&quot;
            android:right=&quot;2dp&quot;
            android:bottom=&quot;2dp&quot; /&gt;
        &lt;corners android:radius=&quot;10dip&quot; /&gt;
    
    &lt;/shape&gt;

Any help would be appreciable.

How can I draw circle through XML Drawable - Android?

&gt; **Possible Duplicate:**  
&gt; [Automatically Delete Files/Folders in R](https://stackoverflow.com/questions/9296377/automatically-delete-files-folders-in-r)  

&lt;!-- End of automatically inserted text --&gt;

I would like to know if there is a way in R to check up if a file is in my current directory, and if it is there then the program deletes it?

I know that other languages have direct access to OS functions to do this task, but I am a little bit dubious if R has that capability.

how to delete a file with R?

> Possible Duplicate: 
> <a href="https://stackoverflow.com/questions/9296377/automatically-delete-files-folders-in-r" target="_blank" rel="noopener noreferrer">Automatically Delete Files/Folders in R</a>

I would like to know if there is a way in R to check up if a file is in my current directory, and if it is there then the program deletes it?
I know that other languages have direct access to OS functions to do this task, but I am a little bit dubious if R has that capability.

I would like to find the location of a character in a string. 

Say: `string = &quot;the2quickbrownfoxeswere2tired&quot;`

I would like the function to return `4` and `24` -- the character location of the `2`s in `string`. 



Find the location of a character in string

I am wondering if there is a function to clear the console in R and, in particular, RStudio I am looking for a function that I can type into the console, and not a keyboard shortcut.

Someone has already provided such a function in [this StackExchange post from 2010](https://stackoverflow.com/questions/2824965/clear-r-console-programmatically). Unfortunately, this depends on the RCom package and will not run on Mac OS X.

Function to clear the console in R and RStudio

When working with data (e.g., in data.frame) the user can control displaying digits by using

    options(digits=3) 

and listing the data.frame like this.

    ttf.all
        
When the user needs to paste the data in Excell like this

    write.table(ttf.all, &#39;clipboard&#39;, sep=&#39;\t&#39;,row.names=F)

The digits parameter is ignored and numbers are not rounded.

See nice output

    &gt; ttf.all
      year V1.x.x V1.y.x ratio1 V1.x.y V1.y.y ratioR V1.x.x V1.y.x ratioAL V1.x.y V1.y.y ratioRL
    1 2006    227    645   35.2     67    645   10.4    150    645    23.3     53    645    8.22
    2 2007    639   1645   38.8    292   1645   17.8    384   1645    23.3    137   1645    8.33
    3 2008   1531   3150   48.6    982   3150   31.2    755   3150    24.0    235   3150    7.46
    4 2009   1625   3467   46.9   1026   3467   29.6    779   3467    22.5    222   3467    6.40


But what is in excel (clipboard) is not rounded. How to control in in `write.table()`?

How to control number of decimal digits in write.table() output?

I&#39;ve been encountering what I think is a bug.  It&#39;s not a big deal, but I&#39;m curious if anyone else has seen this.  Unfortunately, my data is confidential, so I have to make up an example, and it&#39;s not going to be very helpful.

When subsetting my data, I occassionally get mysterious NA rows that aren&#39;t in my original data frame.  Even the rownames are NA.  EG:

    example &lt;- data.frame(&quot;var1&quot;=c(&quot;A&quot;, &quot;B&quot;, &quot;A&quot;), &quot;var2&quot;=c(&quot;X&quot;, &quot;Y&quot;, &quot;Z&quot;))
    example

      var1 var2
    1    A    X
    2    B    Y
    3    A    Z

then I run:

    example[example$var1==&quot;A&quot;,]

      var1 var2
    1    A    X
    3    A    Z
    NA&lt;NA&gt; &lt;NA&gt;

Of course, the example above does not actually give you this mysterious NA row; I am adding it here to illustrate the problem I&#39;m having with my data.

Maybe it has to do with the fact that I&#39;m importing my original data set using &lt;a href=&quot;http://cran.r-project.org/web/packages/xlsx/xlsx.pdf&quot;&gt;Google&#39;s read.xlsx package &lt;/a&gt; and then executing wide to long reshape before subsetting.

Thanks

Subsetting R data frame results in mysterious NA rows

Data:
```R
df &lt;- data.frame(
    type   = c(&quot;T&quot;, &quot;F&quot;, &quot;P&quot;, &quot;T&quot;, &quot;F&quot;, &quot;P&quot;, &quot;T&quot;, &quot;F&quot;, &quot;P&quot;, &quot;T&quot;, &quot;F&quot;, &quot;P&quot;), 
    size   = c(&quot;50%&quot;, &quot;50%&quot;, &quot;50%&quot;, &quot;100%&quot;, &quot;100%&quot;, &quot;100%&quot;, &quot;150%&quot;, &quot;150%&quot;, &quot;150%&quot;, &quot;200%&quot;, &quot;200%&quot;, &quot;200%&quot;),
    amount = c(48.4, 48.1, 46.8, 25.9, 26, 24.9, 21.1, 21.4, 20.1, 20.8, 21.5, 16.5)
)
```

	

I need to plot a bargraph of the above data using ggplot (x-axis -&gt; `type`, y-axis -&gt; `amount`, group by `size`). When I used the following code, I am not getting the variable `type` and as well as `size` in the order shown in the data. Please see the figure. I have used the following code for that. 

     ggplot(df, aes(type, amount , fill=type, group=type, shape=type, facets=size)) + 
      geom_col(width=0.5, position = position_dodge(width=0.6)) + 
      facet_grid(.~size) + 
      theme_bw() + 
      scale_fill_manual(values = c(&quot;darkblue&quot;,&quot;steelblue1&quot;,&quot;steelblue4&quot;), 
                        labels = c(&quot;T&quot;, &quot;F&quot;, &quot;P&quot;))

![enter image description here][1] .

For fixing the order issue, I have used a factor method for the variable &quot;type&quot; using the following. Please see the figure also.

    temp$new = factor(temp$type, levels=c(&quot;T&quot;,&quot;F&quot;,&quot;P&quot;), labels=c(&quot;T&quot;,&quot;F&quot;,&quot;P&quot;)) 

![enter image description here][2]

However, now I don&#39;t know how to fix the order for the variable `size`. It should be 50%, 100%. 150%, and 200%.


  [1]: http://i.stack.imgur.com/bPkne.png
  [2]: http://i.stack.imgur.com/qNHnv.png


Fixing the order of facets in ggplot

I&#39;m trying to write some text to a file using `Files.write()` method.  
  
	byte[] contents = project.getCode().getBytes(StandardCharsets.UTF_8);
		
	try {
		Files.write(project.getFilePath(), contents, StandardOpenOption.CREATE);
	} catch (IOException ex) {
		ex.printStackTrace();
		return;
	}

According to the API, if the file doesn&#39;t exist, it will be created and then written to.  
  
However, I get this:  

    java.nio.file.NoSuchFileException: C:\Users\Administrator\Desktop\work\Default.txt
    	at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
    	at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
    	at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
    	at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
    	at java.nio.file.spi.FileSystemProvider.newOutputStream(Unknown Source)
    	at java.nio.file.Files.newOutputStream(Unknown Source)
    	at java.nio.file.Files.write(Unknown Source)
  
Am I missing something?

Java Files.write NoSuchFileException

I have a method that will iterate through a folder and all of its subfolders and get a list of the file paths. However, I could only figure out how to create it and add the files to a public List&lt;string&gt;, but not how to return the list. Here&#39;s the method:

    public List&lt;String&gt; files = new List&lt;String&gt;();

    private void DirSearch(string sDir)
        {
            try
            {
                foreach (string f in Directory.GetFiles(sDir))
                {
                    files.Add(f);
                }
                foreach (string d in Directory.GetDirectories(sDir))
                {
                    DirSearch(d);
                }
            }
            catch (System.Exception excpt)
            {
                MessageBox.Show(excpt.Message);
            }
        }

So, i just call `DirSearch()` at some point in my code and it &#39;fills&#39; the list with the paths, but I want to be able to use it multiple times to create different lists with different directories, etc.

Method to get all files within folder and subfolders that will return a list

    for i in $(ls);do
        if [ $i = &#39;*.java&#39; ];then
            echo &quot;I do something with the file $i&quot;
        fi
    done

I want to loop through each file in the current folder and check if it matches a specific extension. The code above doesn&#39;t work, do you know why? 

Loop through all the files with a specific extension

`String` variable contains a file name, `C:\Hello\AnotherFolder\The File Name.PDF`. How do I only get the file name `The File Name.PDF` as a String?

I planned to split the string, but that is not the optimal solution.

How do I get the file name from a String containing the Absolute file path?

I am trying to create a folder for each username a user logs in as. Currently I have

    private String destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
    File theFile = new File(destination + username); // will create a sub folder for each user 

but the `File theFile` bit does not create a new folder for the username. How would I do this ?

I have tried 

    private String destination;

    public void File() 
    {
        destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
        File theFile = new File(destination + username); // will create a sub folder for each user (currently does not work, below hopefully is a solution) 
        theFile.mkdirs();
    }

but I need to use the destination later on in the program, how would I do that?

This is my whole code:


    /*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package richard.fileupload;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import javax.annotation.PostConstruct;
    import javax.faces.application.FacesMessage;
    import javax.faces.context.FacesContext;
    import javax.faces.event.ActionEvent;
    import javax.faces.application.FacesMessage;
    import javax.faces.bean.ManagedBean;
    import javax.faces.bean.ViewScoped;
    import javax.faces.context.FacesContext;
    import java.io.File;
    import org.primefaces.event.FileUploadEvent;
    
    @ViewScoped
    @ManagedBean(name = &quot;fileUploadController&quot;)
    public class FileUploadController {
    
        /*
         public void handleFileUpload(FileUploadEvent event) {
         System.out.println(&quot;called&quot;);
         FacesMessage msg = new FacesMessage(&quot;Succesful&quot;, event.getFile().getFileName() + &quot; is uploaded.&quot;);
         FacesContext.getCurrentInstance().addMessage(null, msg);
         }
         }
         */
        private String username;
        private String destination;
    
        @PostConstruct
        public void init() {
            System.out.println(&quot;called get username&quot;);
            username = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
        }
        
        public void File() {
        destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
        File theFile = new File(destination + username); // will create a sub folder for each user (currently does not work, below hopefully is a solution) 
        theFile.mkdirs();
    }
    
        public File getDirectory(String destination, String username) {
            System.out.println(&quot;called get directory&quot;);
            // currently not working, is not calling the username or destination 
            //set the user directory from the destinarion and the logged user name
            File directory = new File(destination, username);
            //check if the location exists
            if (!directory.exists()) {
                //let&#39;s try to create it
                try {
                    directory.mkdir();
                } catch (SecurityException secEx) {
                    //handle the exception
                    secEx.printStackTrace(System.out);
                    directory = null;
                }
            }
            return directory;
        }
    
        public void handleFileUpload(FileUploadEvent event) {
            System.out.println(&quot;called handle file&quot;);
            FacesMessage msg = new FacesMessage(&quot;Succesful&quot;, event.getFile().getFileName() + &quot; is uploaded.&quot;); //Displays to user on the webpage
            FacesContext.getCurrentInstance().addMessage(null, msg);
            try {
                copyFile(event.getFile().getFileName(), event.getFile().getInputstream());
            } catch (IOException e) {
                //handle the exception
                e.printStackTrace();
            }
        }
    
        public void copyFile(String fileName, InputStream in) {
            try {
    
    
                // write the inputStream to a FileOutputStream
                OutputStream out = new FileOutputStream(new File(destination + fileName)); // cannot find path when adding username atm
                System.out.println(&quot;Called CopyFile&quot;); //testing 
                System.out.println(destination + fileName);
    
                int read = 0;
                byte[] bytes = new byte[1024];
    
                while ((read = in.read(bytes)) != -1) {
                    out.write(bytes, 0, read);
                }
    
                in.close();
                out.flush();
                out.close();
    //make sure new file is created, (displays in glassfish server console not to end user)
                System.out.println(&quot;New file created!&quot;);//testing
            } catch (IOException e) {
                e.printStackTrace();
    
                FacesMessage error = new FacesMessage(&quot;The files were not uploaded!&quot;);
                FacesContext.getCurrentInstance().addMessage(null, error);
            }
        }
    }


FINAL EDIT (Hopefully)

     public void copyFile(String fileName, InputStream in) {
            try {
    
                destination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot;; // main location for uploads
                File theFile = new File(destination + &quot;/&quot; + username); 
                theFile.mkdirs();// will create a sub folder for each user (currently does not work, below hopefully is a solution) (DOES NOW WORK)
                
                System.out.println(&quot;Completed File&quot;);
                // write the inputStream to a FileOutputStream
                OutputStream out = new FileOutputStream(new File(destination + fileName)); // cannot find path when adding username atm
                System.out.println(&quot;Called CopyFile&quot;); //testing 
                System.out.println(destination + fileName);
    
                int read = 0;
                byte[] bytes = new byte[1024];
    
                while ((read = in.read(bytes)) != -1) {
                    out.write(bytes, 0, read);
                }
    
                in.close();
                out.flush();
                out.close();
    //make sure new file is created, (displays in glassfish server console not to end user)
                System.out.println(&quot;New file created!&quot;);//testing
            } catch (IOException e) {
                e.printStackTrace();
    
                FacesMessage error = new FacesMessage(&quot;The files were not uploaded!&quot;);
                FacesContext.getCurrentInstance().addMessage(null, error);
            }
        }
    }

Just how can i print out the new destination and use this later on as currently it creates the new folder but does not select it to use


EDIT SOLVED THIS TOO :


        NewDestination = &quot;C:/Users/Richard/printing~subversion/fileupload/web/WEB-INF/uploaded/&quot; + username;

Added the above code and now it all works


Content Type	Original Author	Original Content on Stackoverflow
Question	Layla	View Question on Stackoverflow
Solution 1 - R	Ben Bolker	View Answer on Stackoverflow
Solution 2 - R	IRTFM	View Answer on Stackoverflow

how to delete a file with R?

R Problem Overview

R Solutions

Solution 1 - R

Solution 2 - R

How can I draw circle through XML Drawable - Android?

Change UITableView height dynamically

Attributions