multiple plots from array without loop

Hi all

I have an array (X) holding lets say 20 cycles of data. I would like to plot the entire 20 cycles as a dashed line plot, and then markup (with a solid line) specific segments of the graph, the start and end indexes are in two different vectors S1 and S2. Would it be possible to do something like this:

plot(X,'k--'); 
hold on; 
plot(X([S1:S2]),'r');

instead of using a loop as:

plot(X,'k--'); 
for i=1:length(S1)
plot(X(S1(i):S2(i),r,)
end

The only reason is I would like to avoid loops in my code, as I am plotting several graph segments within my code, and then having 30 for loops does not look good :)

Best, Tommy

[KSSV]

This will work:

plot(X,'k--'); 
hold on; 
plot(X([S1:S2]),'r');

You can try on your own...why doubt?

[Tommy B]

Hi Well because I did try, and it did not work :/

X =[1 2 3 4 5 6 7 8 9 10];
S1=[1 4 9];
S2=[2 5 10];

plot(X,'k--'); 
hold on; 
plot(X([S1:S2]),'r');

I want this to mark the section X= 1-2 & 4-5 & 9-10 with a red line, the rest should be dashed. With the above code it only marks the first segment in red.

Best, Tommy

Answer 1

[KSSV]

I understand now...You may follow some thing like this:

X =[1 2 3 4 5 6 7 8 9 10];
S1=[1 4 9];
S2=[2 5 10];
plot(X,'k--'); 
hold on; 

Y = NaN(size(X)) ;
Y([S1 S2]) = X([S1 S2]) ;

plot(Y,'r');

Introduce NaN's at the place you want to skip...plot will not show NaN's.

Answer 2

[Tommy B]

Yes, perfect! Thanks a lot!

Have a nice weekend.

Best, Tommy