How to plot portion of a vector in matlab?

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Hi,
I am trying to plot a portion (from indis to length(vector)) of a vector (vector) in matlab using the following syntax:
plot(-vector(indis:length(vector))+1)
I don't know what indis will be, that's why my only option is to use indis in the plotting syntax. My issue is that matlab plots -vector(1:length(vector))+1 instead of plotting it as I demanded.
Please help me with this issue.
I would really appreciate your help.
Thanks.
  2 Comments
Azzi Abdelmalek
Azzi Abdelmalek on 9 Feb 2013
What is indis ? What do you want to plot?
MatlabFan
MatlabFan on 9 Feb 2013
indis is an integer, which value I don't know what it will be. I do know that is is an integer greater than 1 and less than length(vector). I am trying to plot 1-vector(indis:length(vector)).

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Accepted Answer

Shashank Prasanna
Shashank Prasanna on 9 Feb 2013
The following piece of code must make things clearer: I make few modifications, Notice I plot with respect to 'x'. If you don't then MATLAB will always assume x = 1:length(vector)
% Create Data
x=0:0.1:2*pi;
vector = sin(0:0.1:2*pi);
% Plot everything
indis=1;
plot(x(indis:length(vector)),-vector(indis:length(vector))+1,'r--');
axis([0 6 0 2])
hold on
% Plot from 20 onwards
indis=20;
plot(x(indis:length(vector)),-vector(indis:length(vector))+1);
axis([0 6 0 2])
  2 Comments
MatlabFan
MatlabFan on 9 Feb 2013
You guys are awesome. I just realized that I had skipped an important step in my code, causing it to not produce the output I expected.My algorithm was correct, I just missed a step. I guess it is because I did not get enough rest lately. But, I certainly appreciate you all, for being there and providing your help. Thanks.

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More Answers (1)

Azzi Abdelmalek
Azzi Abdelmalek on 9 Feb 2013
Edited: Azzi Abdelmalek on 9 Feb 2013
v=1:100
plot(v(40:end))
  2 Comments
Azzi Abdelmalek
Azzi Abdelmalek on 9 Feb 2013
Edited: Azzi Abdelmalek on 9 Feb 2013
You don't need length(vector). just write
y=1-vector(indis:end)
plot(y)
but you need to assign a value to indis
MatlabFan
MatlabFan on 9 Feb 2013
You guys are awesome. I just realized that I had skipped an important step in my code, causing it to not produce the output I expected.My algorithm was correct, I just missed a step. I guess it is because I did not get enough rest lately. But, I certainly appreciate you all, for being there and providing your help. Thanks.

Sign in to comment.

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