Use switch for a matrix row

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JamJan
JamJan on 26 Apr 2018
Commented: Birdman on 26 Apr 2018
Hello,
I want to use switch to create a video with videowriter. I have written this piece of code. I want to use the cases to judge the rows which picture it has to insert as a frame, but if I do this, I get the following error:
SWITCH expression must be a scalar or character vector constant.
Error in FootSwitchDataAnalysis (line 120) switch M3(i,:);
How can I fix this?
M3 = zeros(6,4)
for i=1:size(M3,i);
switch M3(i,:)
case M3(i,:) == [0 0 0 0]
Frame = imread('FootVis.png')
case M3(i,:) == [1 1 1 1]
Frame = imread('FootVis3.png')
end
frame2insert = im2frame(Frame)
writeVideo(v,frame2insert)

Answers (1)

Birdman
Birdman on 26 Apr 2018
Edited: Birdman on 26 Apr 2018
Use if instead switch:
if all(M3(i,:)==[0 0 0 0])
if all(M3(i,:)==[1 1 1 1])
  2 Comments
Birdman
Birdman on 26 Apr 2018
But as said in the error
SWITCH expression must be a scalar or character vector constant.
Therefore you need to take into consideration what I said. Use ismember for comparison of numeric arrays or use all with the structure that I said.
if all(M3(i,:)==[0 0 0 0])
or
if prod(ismember(M3(i,:),[0 0 0 0]))

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