How do i save into a picture file a plot used with hold on(i mean:which has several images plot on a figure)?

for uuu=2000:50:4900;
    name_file=strcat('res_to_U_', num2str(uuu),'.mat')
    BB = load(name_file);
    plot(uuu,BB.Resp(:,3))
    hold on
    saveas(figure,'alright.jpg')
end

Answer 1

[Geoff Hayes]

Ibukunolu - according to saveas, you need to pass in the handle to the figure that you are drawing to. For example,

 hFig = figure;

 for uuu=2000:50:4900;
    name_file=strcat('res_to_U_', num2str(uuu),'.mat')
    BB = load(name_file);
    plot(uuu,BB.Resp(:,3))
    hold on
    saveas(hFig,'alright.jpg')
 end

Of course, on every iteration of the for loop, you will overwrite the alright.jpg. Is this the intent, or do you wish to create a new image/jpg on each iteration of the loop?

[Ibukunolu Oladunjoye]

Thank you.

I wish to create a jpg on the final plot of the for loop. You know that the hold on plots on the same figure. Soni need to creat a jpg for the eventual/final plot(the single plot that plots all the iteration with the hold on)

[Geoff Hayes]

Since you only want to create a jpg of the final plot, then I would move the saveas to outide of the loop

 hFig = figure;
 for uuu=2000:50:4900;
    name_file=strcat('res_to_U_', num2str(uuu),'.mat')
    BB = load(name_file);
    plot(uuu,BB.Resp(:,3))
    hold on
 end

 saveas(hFig,'alright.jpg')

Please try the above. If it doesn't work, then describe the behaviour or errors that you are observing.