MATLAB: Index exceeds matrix dimensions.

hsihyperspectralmatrix

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 12×1 double and VarName2 12×1 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..)

Best Answer

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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Looks like should work presuming your filenames are ok but I'd do it slightly differently.

Try sotoo...

d=dir('*.csv');   % return the list of csv files
for i=1:length(d)
  m{i}=csvread(d(i).name);   % put into cell array
end

Worked here for a few in my working directory.

Note that the files need to be consistent with what content csvread can handle which is numeric array data only.

What specific problem did you encounter?

MATLAB: Separating the Z Vector of a matrix

Because of the disparity in the two sensors I had to read in the two sensors independently. The sensor one is the fist 124 bands and sensor two 231 bands. to do this I created 2 zeros mask that could be use to fill

     pixswir=zeros(231,length(listp));
     pixVnir=zeros(124,length(listp));

The first vector of wavelength was grabbed using a for loop to match each point to my list of points which I called VarName2 for y and VarName1 for x coordinates.

    for i = 1:length(listp)
       %grabs all the pixel values in the z direction
        pix =  img(VarName2(i),VarName1(i),:);
        pixVnir(:,i)=pix(1:124);
   end

I used a similar posses for the other set but i had to create a new x coordinate based on the offset of the two sensors i.e.

     tempVar=zeros(length(listp),1);
     for ii = 1:length(listp) 
        tempVar(ii)=VarName1(ii)+Disoffset(ii);
     end

Then it could be pressed the same as the first only with the tail end of the bands "pixswir(:,i)=pix2(131:end);" This allowed me to append the images to for a new 355 by 20 matrix with each column containing the z vector of that pixel

Best Answer

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MATLAB: Separating the Z Vector of a matrix

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