Use switch for a matrix row

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)

Answer 1

[Birdman]

Use if instead switch:

 if all(M3(i,:)==[0 0 0 0])
 if all(M3(i,:)==[1 1 1 1])

[JamJan]

Thank you, for your quick answer, however:

I had a 16 elseif statements that I used before, because those cases are only 2 of the 16. That worked fine, but I wanted to use switch instead. This was the code:

for i=1:size(M3,i)
%   if M3(i,:) == [0 0 0 0] 
%    A = imread('FootVis.jpeg');
%   elseif M3(i,:) == [1 1 1 1]
%    A = imread('FootVis2.png');
%   elseif M3(i,:) == [1 1 1 0]
%    A = imread('FootVis3.jpg');
%   elseif [1 1 0 0]
%    A = imread('FootVis.jpeg');
%   elseif [1 1 0 1]
%    A = imread('FootVis.jpeg');
%    elseif [1 0 1 1]
%    A = imread('FootVis.jpeg');
%   elseif [1 0 1 0]
%    A = imread('FootVis.jpeg');
%   elseif [1 0 0 1]
%    A = imread('FootVis.jpeg');
%   elseif [1 0 0 0]
%    A =  imread('FootVis.jpeg');
%   elseif [0 1 1 1]
%    A =  imread('FootVis.jpeg');
%   elseif [0 1 1 0]
%    A = imread('FootVis.jpeg');
%   elseif [0 1 0 0]
%    A = imread('FootVis.jpeg');
%   elseif [0 1 0 1]
%    A = imread('FootVis.jpeg');
%    elseif [0 0 1 1]
%    A = imread('FootVis.jpeg');
%   elseif [0 0 1 0]
%    A = imread('FootVis.jpeg');
%   else [0 0 0 1]
%    A = imread('FootVis.jpeg');
%   end
%   frame2insert = im2frame(A)
%   writeVideo(v, frame2insert)

[Birdman]

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]))