Lets say I have a large matrix full of zeros, with a few numbers (1,2,3,4,5) located at various positions. Now I want to calculate the distances from point 1 to 2, 1 to 3, 1 to 4 and 1 to 5. Assuming that e.g. the width of the columns in this matrix is 0.4mm and the width of the rows is 0.25mm. Maybe there is already a code/toolbox out there to do such things?