Separating the Z Vector of a matrix

Say we have a Data Cube that is 768x320x361(i.e. X, Y, Z coordinates). I generate 2 variable list called VarName1 and VarName2 that hold X and Y coordinates. My goal is to get only the first 124 values of the Z vector at each X and Y point and assign the values to columns. Here is the code I have wrote so far

   pixswir=zeros(361,12);
   for i = 1:12
       %grabs all the pixel values in the z direction
        pix =  img(VarName2(i),VarName1(i),:);
        pixswir(:,i)=pix(:);

   end

This will return a matrix 361 x 12 but I only want to grab the first 124 data points of the Z vector and assign them to pixswir so that i have a 124 x 12 matrix. The rest of the values i wish to assign to pixVnir in a 231 x 12 matrix( NOTE:the points on the Z vector 125 to 129 are transition data that is not needed). Any help would be grateful I have tried a few things and keep getting "Subscripted assignment dimension mismatch"

Answer 1

[Shane]

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