deleteFile

Delete file on target hardware

Syntax

deleteFile(mypi,filename)

Description

deleteFile(mypi,filename) deletes the specified file from the target hardware.

Examples

Delete File on Raspberry Pi Hardware

You can delete a file on the Raspberry Pi™ hardware.

deleteFile(mypi,'/home/pi/cap.jpg')

Delete Multiple Files on Raspberry Pi Hardware

You can delete multiple files on the Raspberry Pi hardware using a wildcard character, *.

deleteFile(mypi,'/home/pi/*.jpg') 

Delete File on Raspberry Pi Hardware in MATLAB Online

You can delete files on the Raspberry Pi hardware when connected to it from MATLAB^® Online™. To use your hardware from MATLAB Online, follow the instructions in Connect to Raspberry Pi Hardware Board in MATLAB Online.

When connected to your hardware from MATLAB Online, the default working directory is /home/matlabrpi, instead of /home/pi. This is the only directory you can delete files from. Delete a file in /home/matlabrpi by using the file name as an input argument.

deleteFile(mypi,'myvideo.h264')

Use the Camera Board

You can connect to the camera board from the MATLAB software, take a photograph, and record video.

Create a connection from the MATLAB software to the Raspberry Pi hardware.

mypi = raspi

Create a connection, mycam, from the MATLAB software to the camera board, and set the image resolution. The connection displays the camera board properties.

mycam = cameraboard(mypi,'Resolution','1280x720')

mycam = 

Cameraboard with Properties:

                    Name: Camera Board   
              Resolution: '1280x720'       (View available resolutions)
                 Quality: 10              (1 to 100)
                Rotation: 0               (0, 90, 180 or 270)
          HorizontalFlip: 0              
            VerticalFlip: 0              
               FrameRate: 30              (2 to 30)
               Recording: 0              

   Picture Settings
              Brightness: 50              (0 to 100)
                Contrast: 0               (-100 to 100)
              Saturation: 0               (-100 to 100)
               Sharpness: 0               (-100 to 100)

   Exposure and AWB
            ExposureMode: 'auto'          (View available exposure modes)
    ExposureCompensation: 0               (-10 to 10)
                 AWBMode: 'auto'          (View available AWB modes)
            MeteringMode: 'average'       (View available metering modes)

   Effects
             ImageEffect: 'none'          (View available image effects)
      VideoStabilization: 'off'          
                     ROI: [0.00 0.00 1.00 1.00] (0.0 to 1.0 [top, left, width, height])

Import and display a sequence of 10 snapshots on your computer.

for ii = 1:10
img = snapshot(mycam)
    imagesc(img)
    drawnow
end

If the image is upside down, change its orientation.

mycam.Rotation = 180

You can use the same approach to change the values of other cameraboard properties.

Record a 60 second video.

record(mycam,'myvideo.h264',60)

Stop the recording immediately.

stop(mycam)

Copy the video from the board to your computer.

getFile(mypi,'myvideo.h264','C:\MATLAB ')

Delete the video file from the hardware to free up space.

deleteFile(mypi,'myvideo.h264')

Input Arguments

mypi — Connection to specific Raspberry Pi hardware board

raspi object

Connection to a specific Raspberry Pi hardware board, specified as a raspi object.

filename — File to delete

file name

File to delete, specified as a string. You can delete a file on the Raspberry Pi hardware. When you specify the file name, you can use path information and wildcards. In MATLAB Online, you can only delete files in the default working directory, /home/matlabrpi.

Example: '/home/pi/cap.jpg'

Example: '/home/pi/*.jpg'

Example: 'myvideo.h264'

Data Types: cell