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Re: Need Help Plotting exp(-0.5*x)*sin(x)

From: viveks
Subject: Re: Need Help Plotting exp(-0.5*x)*sin(x)
Date: Sun, 6 Aug 2000 11:08:23 +0530 (IST)

On Sat, 5 Aug 2000, Jonathan Drews wrote:

> x=(0.0:0.1:10.0)';
> data=[x,exp(-0.5*x)*sin(x)]
> It returns the message:
> error: operator *: nonconformant arguments (op1 is 101x1, op2 is 101x1)
> error: evaluating assignment expression near line 8, column 5 

Use ".*" instead of "*". The former is elementwise operation, and the
latter is defined as matrix multiplication. Try the code below:

        x=[0.0:0.1:10.0] ;
        y=exp(-0.5*x).*sin(x) ;
        plot (x, y)

It will be a good idea to spend an hour going through online docs of octave
using the command:

        help -i

There are enough examples there.


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