hi i need to do heatmap and have some problem with histcounts functions and the map

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';
end
heatmap(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 !

Answer 1

[KSSV]

You have to save the values into a matrix in loop, which you are not doing.

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

[Litalo]

thanks

yet i see dark graph

i know its because the Accumulated_Prob have dimensions of 50rows and 5000cols

yet, is it a way to show the data for every d ?

[KSSV]

try:

pcolor(Accumulated_prob) ;
shading interp 

Is the plot looks good?

[Litalo]

yes. thanks. :)

[KSSV]

Thanks is accepting/ voting the answer. :)