Question about plotting, getting subvectors

Hi,

I'm new to Matlab central, but not new to Matlab itself. I'm running a simulation which has an end results of two columns of values. I ususally plot these values using plot(1stcolumn,2ndcolumn). My question is: how do I plot only a small amount of these values? Like say 1stcolumn(40) to 1stcolumn(60)? I've tried exactly this in Matlab, but I am only getting an empty graph sheet (no errors are showing either):

plot(1stcolumn(40),2ndcolumn(40),1stcolumn(40),...
2ndcolumn(40)1stcolumn(40),2ndcolumn(40),...
1stcolumn(40),2ndcolumn(40))

What am I doing wrong?

RebSam

Answer 1

[Paulo Silva]

vector(1:40) %get all values from index 1 to 40

Your mistake is that you just plot the value at index 40 with your code vector(40)

Answer 2

[Jan]

"1stcolumn", "2ndcolumn" etc are no valid Matlab symbols, because they start with a number. Are you sure that the posted code does not produce errors?!

[Paulo Silva]

good catch, for some strange reason I didn't noticed that the variables started with numbers, too much trust on OP codes.

Answer 3

[REBECCA]

Sorry,

I just picked the first thing that came to my head when I was posting. That's not the actual name. It more like n1(...) and y1(...).

[Paulo Silva]

REBECCA and all that might read this, please do the effort of trying the code first before asking questions, that saves us time and we can use the extra time to help others.