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Index exceeds matrix dimensions. ?

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Shane
Shane 2014-9-10
评论： Shane 2014-9-10
Hear is my code
%%Get Full Image Data
% ENVI Import Cube and Register images
datafile = '0604img-17_FlatField';
hdrfile = '0604img-17_FlatField.hdr';
%%Read ENVI Files
[im, hdr] = enviread([old '\' datafile],[old '\' hdrfile]);
img = imrotate(im,90, 'nearest');
figure; imshow(img(:,:,124));
%d = reshape(textread('listplot.txt', '%s'),1,12)';
%list of coordinates as x and y
load('listp.txt');
for i = 1:12
% pixval(i) = i+ img(d,:);
pixval(i) = i+ img(VarName1,VarName2,:);
end
It says it exceeds matrix dimentions. Some info: the "load (listp.txt) " outputs 2 list VarName1 12x1 double and VarName2 12x1 double. What i was doing before to call the information was to
pixval = img(74,100,:)
this gave me a 1x1x361 matrix with all the data of that point. What I want to do is store the multiple points without having to create a variable for each (I.E. pixval1, pixval2 ext..)

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Adam
Adam 2014-9-10
By the sounds of it you want:
pixval(i) = i+ img(VarName1(i),VarName2(i),:);
rather than using the full VarName1 and VarName2 every time if they are length 12 vectors.
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Adam
Adam 2014-9-10
编辑：Adam 2014-9-10
Well, I guess the obvious next question is what is the range of the values in VarName1 and VarName2 relative to img?
Actually, looking at it again I imagine the error comes from the pixval(i) assignment.
img(VarName1,VarName2,:) is going to return a vector of values so I imagine you need:
pixval(i,:) = i + squeeze( img(VarName1(i),VarName2(i),:) );
or something similar to that.
You should probably pre-allocate pixval too, but that is just for efficiency and isn't going to affect whether the code works or not in this case.
Shane
Shane 2014-9-10
Thanks Adam, this gave me direction for what I needed to change to make it work
pixval=zeros(361,12);
for i = 1:12
pix = img(VarName2(i),VarName1(i),:);
pixval(:,i)=pix(:);
end

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