Could someone tell me an easy way to plot graph when kk varies from 1 to 100?

I run the function file

for kk = 1:4

and saved by using

save(['A', num2str(kk),'.mat']) command and then I plot the graphs as follow

clear

clc

A1 = load('A1.mat');

A2 = load('A2.mat');

A3 = load('A3.mat');

A4 = load('A4.mat');

DAT1 = A1.var_emg_value';

DAT2 = A2.var_emg_value';

DAT3 = A3.var_emg_value';

DAT4 = A4.var_emg_value';

x = A1.Bvalues;

figure()

plot(x,DAT1,'r');

hold on

plot(x,DAT2,'c');

hold on

plot(x,DAT3,'g');

hold on

plot(x,DAT4,'k');

Could someone tell me an easy way to plot graph when kk varies from 1 to 100?

Answer 1

[Jakob B. Nielsen]

Do you need all the variables open with every information in the workspace after the plotting? If not, I would do something like this. (Note you dont need to hold on after every plot. When you set hold on, hold is on until you tell it to be off.

A1 = load('A1.mat');
x=A1.Bvalues; %am I correct in assuming your x is the same for every run? Otherwise you must define it within the loop
hold on
for j=1:100
    runningfilename=strcat('A',num2str(j),'.mat'); %this should give you 'A1.mat' first run, 'A2.mat' 2nd run, etc.
    data=load(runningfilename);
    yplot=ata.var_emg_value; %if you dont need any matrix/table with data, just the plots. 
    %%%% OR
    %yplot(:,j)=data.var_emg_value;   %you will end up with a yplot matrix of dimension ?x100 

    
    %and finally plotting:
    plot(x,yplot); %OR plot(x,yplot(:,j)); if you go with the matrix option. 
end

Try this - it should produce 100 plots in the same window (notice how hold on is only called once). You can do all sorts of clever things with indexing and for loops, once you know how :)

[WalterWhite]

shouldn't the hold on be specified under the plot function inside the for loop?

figure()

hold on;

for i = 1:100

f=strcat('A',num2str(i),'.mat')

A(i) =load(f);

DAT = A(i).var_emg_val;

x = A(i).Bvalues;

plot(x,DAT)

end

[Jakob B. Nielsen]

Use the hold on function.

hold on
for i = 1:10
...
..
end

It doesnt have to be unside the loop. Hold on is not specific to the plot window - it is like a light switch. If hold is "on", you always plot a new plot in the active graph window (or make a new window if there is no graph window). hold will be "on" until you type hold off, which is like turning the light off again. Having hold on inside the loop just turns the light on 100 times - nothing wrong with it, of course, but not strictly needed.

[WalterWhite]

Thanks Jakob and moving the figure() outside the for loop may do parag

[parag gupta]

Yeah, you are right jakob :)

THANKS ALL :)

[parag gupta]

yeah, done Walter.

Thank you so much. :)

Answer 2

[CAM]

Have you considered putting all emg data columns in a cell array, with the first cell containing the x-values? That way you only have to save one mat-file.

If you want to keep the separate files, you could use a loop to build the cell array as you read each file (and add to the plot).

[parag gupta]

thanks CAM :)