ok

so thats the problem –

i have vector d (size 5,000)

and i have matrix mat_X which show positions – every column show x positions over time for corresponding d in the vector (my original mat_X is 5000*5000 matrix)

so i want to built accumulated heat map of position along x (col from mat_X) for different d value (1position from the vector for the first col, 2 for 2nd and so on)

so for doing so, i need first to use histcounts for every col (since my data is not so small )

so i did this loop

`bins=50;Accumulated_Prob=zeros(bins,length(d));for i=1:length(d) [P,cc] = histcounts(mat_X(:,i),bins,'normalization','probability'); Accumulated_Prob=Accumulated_Prob+P';endheatmap(Accumulated_Prob)title('Accumulated Heat Map of RF x position, Vf at x=-1')xlabel('d')ylabel('x')`

but… i get only black graph…

i would appreciate help !

## Best Answer