sort the in plot

hi.

i have 2 matrix:

a = [ 1.2 6 3]
b = [ 2 4 5]

How do I plot this so that the x and y axes are arranged from less to more?

"x" axes is "a" and "y" axes is "b"

the result for plot should be like this:

x=1.2 , y=2 ------ x=3 , y=5 ----- x=6 , y=4

Answer 1

[dpb]

Many possible ways...

1. Sort a, keep index for b ---

[a,ix]=sort(a);             % sort a, keep order index, replace a with sorted vector
b=b(ix);                    % reorder b to match
plot(a,b)                   % now are in order on abscissa

2. Use array features instead of separate vectors...

ab=sortrows([a(:) b(:)],1); % combined array of a,b by column sorted by column 1 (a)
plot(ab(:,1),ab(:,1))       % plot the two columns against each other

Any number of permuations of the above are also possible to get to same result including not overwriting the original vectors, doing the sorting "on the fly" in the arguments of the call to plot() instead of making explicit variables, etc., etc., etc., ...

[HADIMARGO]

TNX BROTHER.

[a,ix]=sort(a);             % sort a, keep order index, replace a with sorted vector
b=b(ix);                    % reorder b to match
plot(a,b)                   % now are in order on abscissa

THIS CODE SOLVED MY PROBLEM.

HOW DID YOU KNOW THIS "[a,ix]=sort(a);"? which book or website?

[dpb]

See

doc sort

read about the possible return values...

It's always the place to start... :)