In Matlab, after plotting a figure then I select a range of area and replot again

Here is my program and figure, and I want to select a range of area and replot again finally calculate RMS

num1 = xlsread('2.1mm.csv','A2:A999999');

num2 = xlsread('2.1mm.csv','2.1mm','A3');

num3=(num1-num2)*86400;

num4 = xlsread('2.1mm.csv','c2:c999999');

plot(num3,num4);

set(gca, 'Fontname', 'Times New Roman','FontSize',24);

xlabel('time(sec)');

ylabel('g');

set(get(gca,'ylabel'),'rotation',0)

title('Spindle');

Sorry for the first consultation

Answer 1

[KSSV]

Yes you can very much do it....

If you have limits/ range for x-axis; you can limit your range in the existing plot using xlim, ylim, axis.

If you want to plot again and you want to restrict the range with data itself. Let val0 and val1 be your x-axis ranges.

idx = num3 >= val0 && num3 <= val1 ;   % get indices 
num3 = num3(idx) ;
num4 = num4(idx) ;

plot(num3,num4)

[Teng Cheng Kang]

Thanks for your reply

But I want to select the area range in the graph I drew at the beginning

Is it the same method?

Sorry i'm a beginner

[KSSV]

Okay do the same thing with num4 also.....introduce indices in both x-axes and y-axes.

[Teng Cheng Kang]

I have tried it but he seems to have some errors

[KSSV]

Try:

idx = num3 >= 1 & num3 <=10 ;

[Teng Cheng Kang]

It worked successfully

Thank you very much for solving my problem