using eval with 2 variables

Hi I´m having a problem with this code:

L11 = imread('ocidoiris\001l.bmp');
L12 = imread('ocidoiris\001l.bmp');
L13 = imread('ocidoiris\001l.bmp');
L14 = imread('ocidoiris\001l.bmp');
L15 = imread('ocidoiris\001l.bmp');

frameNumber=1;
frame=1;

while frameNumber<2
    while frame<6

NAME = sprintf('L%d%d',frameNumber,frame)
I=eval(sprintf('%s',NAME));

%I=eval(sprintf('L%d%d', frameNumber, frame)); 
 I=im2double(I);

all I need is a result L11 L12 L13 L14 L15 but I need variable framenumber and frame for another for loop and for putting pictures that are converted from L11 to RGB, CMY to different folders... You can see, I´m using it here:

        baseFileName = sprintf('00%dL%00%d.bmp', frameNumber, frame);
        baseFileName2 = sprintf('00%d/L',frameNumber);
        fullFileName = fullfile('OCI/',newdir, baseFileName2, baseFileName);

Can you help me with this problem? Thanks

Answer 1

[Geoff Hayes]

Alexandra - why not avoid using eval altogether and just store your images in a 1x5 cell array which you can then iterate over without having to worry about variable names that are dependent upon the frame number and frame. Something like

 maxFrame       = 5;
 maxFrameNumber = 1;

 frameData = cell(maxFrameNumber,maxFrame);

 frameData{1,1} = imread('ocidoiris\001l.bmp');
 frameData{1,2} = imread('ocidoiris\001l.bmp');
 frameData{1,3} = imread('ocidoiris\001l.bmp');
 frameData{1,4} = imread('ocidoiris\001l.bmp');
 frameData{1,5} = imread('ocidoiris\001l.bmp');

 atFrame       = 1;
 atFrameNumber = 1;

 while atFrameNumber<=maxFrameNumber

    atFrame = 1;

    while atFrame<=maxFrame

         I = frameData{atFrameNumber,atFrame};

         % do your work with I

         % save to file

         % increment atFrame
         atFrame = atFrame + 1;
    end

    % increment atFrameNumber
    atFrameNumber = atFrameNumber + 1;
 end

You should still be able to do what you want without the troublesome eval calls (which make debugging problems - like this one - a challenge!).

Answer 2

[Alexandra Bilanska]

Thanks, your code worked . I changed a small mistake in my code and it worked too.. Thanks :)