Want to run the code for n values of X0, tried using for loop but didn,t get desired output.how to run for n values of X0?

if true

 X = [ 0, 15 30 45 ];
 Y = [50, 8.5, 2, 0.5];
 X0 = 0; 
 n = 100; 
 f = 0.1; 
x = linspace(min(X),max(X),n); 
y = interp1(X,Y,x,'spline'); 
xt = X0+(0.1*(max(X)-min(X))*[-1 0 1]);
m = diff(y)./diff(x);
m = [m, m(end)]; 
k = min([find(x >= X0,1,'first'), length(x)]);

yt = y(k) + m(k)*(0.1*(max(X)-min(X))*[-1 0 1]);

plot(X,Y,'ro', x,y,'-b',xt,yt,'--g');

 % code
  end

[Geoff Hayes]

Please format the above code so that it is readable. Highlight the code portions (not your text that asks a question or states the error) and press the {} Code button.

[Geoff Hayes]

What do you want the n values for X0 to be? The first is zero, the second one is… What should this sequence be?

[vaishali]

X0=0:10

Answer 1

[Geoff Hayes]

If X0 varies from 0 to 10 (and we assume a step size of 1), then a for loop could be introduced as follows

 X0data = 0:1:10;
 for i=1:length(X0data)
     X0 = X0data(i);
     X = [ 0, 15 30 45 ];
     Y = [50, 8.5, 2, 0.5];

     % etc.

     plot(X,Y,'ro', x,y,'-b',xt,yt,'--g');

     hold on;  % to allow multiple plots on same figure
 end

Try the above and see what happens.

[vaishali]

Thank you very much .

[Geoff Hayes]

Anytime!

[vaishali]

want to plot outside for loop;want to keep command: plot(X,Y,'ro', x,y,'-b',xt,yt,'--g'); hold on; outside for loop .is it possible?

[Geoff Hayes]

Yes…but then you have to "save" X and Y at each iteration. Try it out and see.