# Value of a variable not changing in the workspace ??

8 views (last 30 days)
Kaleesh Bala on 18 Feb 2019
Commented: Kaleesh Bala on 20 Feb 2019
The value of j goes upto 1025 but i stays at 255 itself ,what's the error in this nested loop??
for i=245:61503
i = i+10;
for j=1:1024
j=j+1;
figure(); hold on
plot(Y.y(1:i,j))
set(0,'DefaultFigureWindowStyle','docked')
end
end
hold off

Kaleesh Bala on 18 Feb 2019
Also tried with the reshape to obtain a 3D and it seems not working great as it has varying no.of.elements .
rows = 61503;
cols = 1024;
samples = 61503; % possible samples
Data = reshape(Y,rows,cols,samples);
Data = flip(X,1);
figure
surf(abs(sqrt(log10(sum(Data.^2,3))))); shading interp; view(2); set(gcf,'Renderer','zbuffer'); axis equal
print('-djpeg','-r200',['logRMS_', filename(1:end-4), '.jpg']);
Rik on 18 Feb 2019
Why don't you try explaining what you want to do? That way we can try to solve your actual issue, instead of the errors from your solution.
Kaleesh Bala on 18 Feb 2019
Alright I have x =1x1024 and y = 61503x1024 matrices
X =x,Y=y
I'm trying to plot a 2D plot and 3D plot for it at every 10th step:
Like for y 1:247 and then y 247:494 till 61503 , x goes as 1 and linearly to 1024
so the normal plot goes as for 2D : plot(Y.y(1:247,1) for the first plot and goes on
I would like to convert this data to 3D values and then plot surf for it.
May be not for all the values just for 1,mid value and end value.

ibabinaca on 18 Feb 2019
Edited: ibabinaca on 18 Feb 2019
Why are you putting j = j+1? There is no need to put it with matlab.
for i=245:10:61503
for j=1:1024
figure(); hold on
plot(Y.y(1:i,j))
set(0,'DefaultFigureWindowStyle','docked')
end
end
hold off
By the way, 245+10*n is never going to be 61503

Rik on 18 Feb 2019
This code solves the error, but not the issue. This will still open 1024 figures for every i it iterates over. Your computer (or just Matlab) will probably crash.
Kaleesh Bala on 18 Feb 2019
Alright you're right , for i=247:10:61503 this goes to 61503.
Could you lemme know how can I convert it to 3D values and the plot a surf out of it?
Kaleesh Bala on 20 Feb 2019
Alright matlab crashes for sure :) due to rendering issues.