strange Index exceeds matrix dimensions (MATLAB bug?)

Hi all,

I have a function running in particular the following code (sI and tdii2 are matrices):

    % debugging
    class(sI)       % double
    class(tdii2)    % uint32
    size(sI)        % 512   672
    numel(sI)       % 344064
    min(tdii2(:))   % 1
    max(tdii2(:))   % 343988  (not 391863)
    save('temp55.mat', 'sI', 'tdii2'); 

    % this line produces an error
    imgvals = sI(tdii2);

When I run it, it breaks with

    ??? Index exceeds matrix dimensions.

    Error in ==> backproject_single at 133
          imgvals= sI(tdii2);

Even worse, when I execute this

    load('temp55.mat', 'sI', 'tdii2');
    imgvals= sI(tdii2);

in the console, it works perfectly fine.

I am totally puzzled.... Has anyone an idea what the cause could be?

Thanks Thomas

Answer 1

[Matt Fig]

If size(sI) is as you say, then indexing into it with values greater than 512*672 = 344064 should indeed cause an error!

max(tdii2(:)) > (512*672)  % Returns true using 391863 for L.H.S.

[Thomas]

Thanks Matt! Sorry, I mistyped the number, it was below 344064 (3439XX, the XX I don't remember.... )

I cannot reproduce the error now since Matlab keeps crashing with seg violation and bluescreen whenever I run the program.

It is pure matlab code, it does not use .mex files.

So probably there is something seriously wrong. I'll reinstall and keep you updated whether that helps.

[Thomas]

Update: I reinstalled matlab,... at least the bluescreens are gone now, but the problem remains. (and max(tdii2(:)) = 343988)