how to plot a specific column of a matrix

hi there , i have a 115340*3 matrix i want to plot just the second column of it, how can i do that ? any help would be appreciated.

Answer 1

[Mischa Kim]

Amin, use

 plot(mymat(:,2))

where mymat is the matrix.

[Amin]

tq dear Mischa , it works ;) and another Q is that how can i plot the 2nd & 3rd column in a x-y axis ? u know , the 3rd column base on 2nd column ?

[Michael]

maybe you can try:

plot(mymat(:,2),mymat(:,3));

[Michael]

this plots the 2nd column on the x-axis and 3rd column on the y-axis...is that what you meant?

[Amin]

unfortunately not ,

all i need is just s.th like this image

[Amin]

and what i got from ur cmnd is like this

Answer 2

[Michael Haderlein]

That looks as if your data is not sorted. Either you don't plot the lines

plot(...,'.')

or you sort beforehand:

[sort1,ind]=sort(matrix(:,2));
sort2=matrix(ind,3);
plot(sort1,sort2)

Best regards,

Michael