MATLAB: Keeping track of variables

symbolicSymbolic Math Toolbox

In short, i've written a script that moves around colums in matricies and vectors. Now I need to be able to keep track of it all. I need to be able to assign a name to each column, say x1, x2 etc, so that I easily can determine where they all end up. This is what I've tried so far:

cN=[x1 x2]'==[2 1]';

But i end up with this message: "Input arguments must be convertible to floating-point numbers."

Best Answer

No, you really don't need that, or even want that. And here's why: The FAQ

If you want to keep track of the new destinations of the values you sent an element at a particular (row, column) to, then just make two matrices that record where the values went to

newColumns(row, col) = newColumn;    % Record the new column of this element of the matrix.
newRows(row, col) = newRow;    % Record the new row of this element of the matrix.

Related Solutions

MATLAB: Inserting a column vector as a column in a new matrix.

new_matrix = [1s_col X X^2]

MATLAB: Move all counts of the image in random direction

You need to scan your original image, and if the value is not zero (meaning that there is a photon in the original CCD well or whatever the image represents) then you need to calculate the new location (row,col) by adding a deltax and deltay taken from a Poisson distribution. Then add the photon to the output location and (optionally) remove it from the input location.

outputImage = zeros(rows, columns);
for col = 1 : columns
    for row = 1 : rows
        if originalImage(row, col) > 1
            newRow = round(row + random('Poisson', pd));
            newCol = round(col + random('Poisson', pd));
            % Increment the number of pixels at this output image location.
            outputImage(newRow, newCol) = outputImage(newRow, newCol) + 1;
            % Decrement the number of photons at this output image location (only if you want to)
            originalImage(row, col) = originalImage(row, col) - 1;
        end
    end
end

See documentation for random() in the Statistics and Machine Learning Toolbox for info on how to get pd, the probability distribution object.

Best Answer

Related Solutions

MATLAB: Inserting a column vector as a column in a new matrix.

MATLAB: Move all counts of the image in random direction

Related Question