Re: bode, "arguments must be scalars" error

[Norm Hecht]

Guido,

I tried your example on my Intel Mac running Octave 2.9.9, and
it worked like it was supposed to, giving me a correct Bode diagram.
So it will work on some machines--does  anyone know what to check
to track this bug down?

Norm Hecht

On Mar 13, 2007, at 10:52 AM, Guido Mureddu wrote:

> Hello, I'm not sure whether this is the correct place to post this,  
> so excuse me if it isn't. I'm currently using Octave 2.1.73, on  
> Linux. I'm trying to get the bode plot of the simple transfer  
> function 1/s.
> I try to accomplish this in this way:
>
> | octave:1> G = tf(1, [1 0])
> | octave:2> sysout(G)
> | Input(s)
> |       1: u_1
> |
> | Output(s):
> |      1: y_1
> |
> | transfer function form:
> | 1
> | ---------
> | 1*s^1 + 0
>
> Which seems to be correct. However, when I try to plot it using the  
> bode function, it produces this error:
>
> | octave:3> bode(G)
> | error: logspace: arguments must be scalars
> | error: evaluating if command near line 85, column 3
> | error: called from `logspace' in file `/usr/local/share/octave/ 
> 2.1.73/m/general/logspace.m'
> | error: evaluating assignment expression near line 78, column 9
> | error: evaluating if command near line 67, column 5
> | error: called from `__freqresp__' in file `/usr/local/share/ 
> octave/2.1.73/m/control/base/__freqresp__.m'
> | error: called from `__bodquist__' in file `/usr/local/share/ 
> octave/2.1.73/m/control/base/__bodquist__.m'
> | error: called from `bode' in file `/usr/local/share/octave/2.1.73/ 
> m/control/base/bode.m'
>
> What am I doing wrong? My Linux distribution (Ubuntu 6.06) has a  
> precompiled package of Octave 2.1.72, so I removed it and compiled  
> 2.1.73 hoping it would solve it, but unfortunately, no such luck.
>
> Thanks for your help,
>
> Guido Mureddu
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