How to Plot a graph with restriction?

Hi,

I am sorry I am new to MATLAB and dont know how to exactly formulate my quetsion.

I want to plot a graph between two variables but I want to restrict the plot area with a third varible. For example:

x = (0.5*pi:0.1:6*pi) y = sin(x)

Plot (x,y)

but now i want to restrict my plot with the following variable:

z = (pi:0.1;2*pi)

Note: The divisions are same for 'x' and 'z'.

Thanks, Mustahsan

Answer 1

[Mischa Kim]

Mustahsan, what do you mean by restrict? Setting the plotting limits? Something like:

 xlim([pi, 2*pi])

[Mischa Kim]

Use, e.g.,

 x = (0.5*pi:0.1:6*pi); 
 y = sin(x);
 z = [pi; 2*pi];
 plot(x(x>z(1) & x<z(2)), y(x>z(1) & x<z(2)))

For z you really only need the limits.

Please add follow-up questions and comments as such and not as answers to keep the thread readable.

[Mustahsan Majeed]

Sory for replying on the answer section!

Okay following is what i typed, which niether gives me a figure nor a graph

 plot(n(n>POS_thr(95) & n<POS_thr(100)), M_ISO(M_ISO>POS_thr(95) & M_ISO<POS_thr(100)))

Where POS_thr is a variable and I want to plot n & M_ISO but with the restriction that POS_thr should only be between 95 and 100.

I hope you get my point!

[Mischa Kim]

Since I do not know what your variables are, check out

 x = (0.5*pi:0.01:6*pi); 
 y = sin(x);
 z = 2*cos(x).^2;

 plot(x,y,x,z)
 hold on
 plot(x(z>0.5 & z<0.8), y(z>0.5 & z<0.8),'or')

z needs to be within [0.5 0.8] for the second plot.

[Mustahsan Majeed]

All the three variables are attached with this reply. All three have same number of rows but I only want to plot 'n' against 'M_ISO' using only those rows where 'POS_thr' is between 95 to 100.

[Mischa Kim]

Use

 plot(n(POS_thr>=95 & POS_thr<=100), M_ISO(POS_thr>=95 & POS_thr<=100),'or');

Answer 2

[Michael Haderlein]

Dear Mustahsan,

not sure if that's what you mean, but please check for

xlim([pi 2*pi])

Best regards, Michael