User Defined Montage but filling 12x8 Array

Hello, I am scanning a sample that has a possible 12x8 locations. The user defines the positons to scan and the scan order is indicated by the number in the cells

I have a 1D cell array containing the images from the scan

imgArray{n}

I also have the row and col locations for each image

            row=app.Positions(:,1)   %column 1 for row locations
            col=app.Positions(:,2)   %column 2 for col locations

Whats the best way to create a montage splatting the images in the montage reflecting the positon in the table. For each image i have the row and col positons they were captured in. I would like to always display a 12x8 montage and just put positions where no image was created to e.g. blank (zero)

This was my attempt.

          %First  create "blank"  images of zeros and position in all 12x8 locations
          
            [sy,sx]=size(app.imgArray{1})  % Get size of each image, just used the 1st one as the size doesnt change
            B=zeros(sy,sx);                %Create a blank image
            for j=1:8
                for i=1:12
                   M(i,j)=B;               %create a 12x8 array of blank images
                end
            end    

Now positon the real images at their repsective locations

            for i=1:m         %m is the number of images
                r=row(i); c=col(i);
                M(r,c)=app.imgArray{i}
            end 

But I can't get passed creating the montage of blank images:

Error in HPBR/montage (line 1402)
                   M(i,j)=B;

Answer 1

[Rohit Pappu]

A possible workaround is as follows

% Create an empty cell array of size 12x8
imgList = cell(96);

% calculate the cell array position for each image based on 
% it's row and column
pos = (row-1)*8 + col; % eg. 2nd row 3rd column image has a cell array position of (2-1)*8+3 =11
imgList{pos} = imgArray; % Store the images in a new cell array based on the position they should appear in imtile

imtile(imgList,'GridSize',[12 8]); % Create a 12x8 grid and place the images in the correct position