Summation of two matrices

Hi guys,

I really need your help with the summation of matrices in Matlab.

I have two matrices (180,360), which counts a total of 129 600 values, with different numbers. I would like to sum all the elements within this two matrices as follows:

• value from the 1st row and 1st coloumn of the 1st matrix sum with the value from the 1st row and 1st coloumn of the 2nd matrix,
• value from the 1st row and 2nd coloumn of the 1st matrix sum with the value of from the 1st row and 2nd coloum of the 2nd matrix,
• and so on until the end.

I tried to do next:

Z = A + B and I get only one value in the last row and last coloumn. All the others values are zero (0) even the values in the both matrices are NOT zero (0). I also tried to use funtion SUM like Z = sum (A + B) but I got the result equel to 2 x Z in the last row and last coloumn.

Is there any other (easy) trick to sum this matrices?

Thank you in advance.

[Dave B]

Z = A+B; will work in general, could you save your two variables out to a .mat file and upload it to your question so we can debug?

A=rand(180,360);
B=rand(180,360);
Z=A+B;
imagesc(Z) %just to demo that something is in here that's not zero...

[Dominik Jerinic]

The two matrices are in the attachment...

[Dave B]

Maybe I didn't understand the problem. one of these matrices has a bunch of zeros on the sides and a bunch of values in the middle, the other has the opposite pattern. They have one column where they overlap. When I add them I see their summed values

load Izb_hv_p
load Izb_hv_bl

Z=Izb_hv_bl+Izb_hv_p;

% Look at some random rows/columns:
for i = 1:10
    r=randi(180);
    c=randi(360);
    fprintf('Izb_hv_p: %0.2f + Izb_hv_bl: %0.2f = Z: %0.2f\n', Izb_hv_p(r,c), Izb_hv_bl(r,c), Z(r,c))
end

Izb_hv_p: 4.05 + Izb_hv_bl: 0.00 = Z: 4.05
Izb_hv_p: 4.21 + Izb_hv_bl: 0.00 = Z: 4.21
Izb_hv_p: 0.00 + Izb_hv_bl: 1.40 = Z: 1.40
Izb_hv_p: 4.49 + Izb_hv_bl: 0.00 = Z: 4.49
Izb_hv_p: 3.65 + Izb_hv_bl: 0.00 = Z: 3.65
Izb_hv_p: 1.39 + Izb_hv_bl: 0.00 = Z: 1.39
Izb_hv_p: 1.53 + Izb_hv_bl: 0.00 = Z: 1.53
Izb_hv_p: 0.00 + Izb_hv_bl: 1.39 = Z: 1.39
Izb_hv_p: 0.00 + Izb_hv_bl: 2.74 = Z: 2.74
Izb_hv_p: 3.76 + Izb_hv_bl: 0.00 = Z: 3.76

% Visualize the whole thing as an image:
t=tiledlayout(3,2);
nexttile
imagesc(Izb_hv_bl)
title('Izb_hv_bl','Interpreter','none')

nexttile
imagesc(Izb_hv_p)
title('Izb_hv_p','Interpreter','none')

nexttile([2 2])
imagesc(Z)
title('Z')
set(t.Children,'CLim',[0 max(Z,[],'all')])
colormap turbo

[Dominik Jerinic]

OK, I find out what was wrong in my calculation.

I had (j,i) in the brackets after Izb_hv_bl and Izb_hv_p. Now I deleted this brackets and everything seems to sum right.

I will check that one more time but I thing it will work fine.

Thank you for your help and your time.


Best regards mate.