Re: Help-octave Digest, Vol 30, Issue 65

[Russell jarvis]

I wonder if any can tell me how to declare an empty multidimensional
array or matrix.

I declare a blank 1 dimensional array:

array1 = [];

but I want to do something like:

array2=[][];

Thanks for any help.

Russell.

On Thu, Sep 25, 2008 at 3:03 AM,  <address@hidden> wrote:
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> Today's Topics:
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>   1. Re: Fwd: Gaussian fit of a peak (LUK ShunTim)
>   2. Re: Gaussian fit of a peak (Rob Mahurin)
>   3. Re: strange regexp behavior (John W. Eaton)
>   4. Returned value from function as a global variable (LUK ShunTim)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 24 Sep 2008 18:08:21 +0800
> From: LUK ShunTim <address@hidden>
> Subject: Re: Fwd: Gaussian fit of a peak
> To: Andrea Cimatoribus <address@hidden>
> Cc: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=UTF-8
>
> Andrea Cimatoribus wrote:
>> Here is what Octave says:
>>
>> octave-3.0.0:3> pkg install miscellaneous-1.0.7.tar.gz
>> configure: WARNING: no mkoctfile found on path
>
> You need to install the octave3.0-headers debian/ubuntu package (which
> provides mkoctfile etc) to install most octave-forge packages.
>
> Regards,
> ST
> --
>
>
> ------------------------------
>
> Message: 2
> Date: Wed, 24 Sep 2008 11:26:23 -0400
> From: Rob Mahurin <address@hidden>
> Subject: Re: Gaussian fit of a peak
> To: "Andrea Cimatoribus" <address@hidden>
> Cc: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed
>
> On Sep 24, 2008, at 4:04 AM, Andrea Cimatoribus wrote:
>> Unfortunately, I am not sure I will be able to keep "central" area
>> only, since I am fitting something that resembles a phonon spectra.
>> In fact, I have multiple peakes to the left and right with respect
>> to the "zero", but fitting everything with a gaussian balanced to
>> the zero energy pretty well. I need to do this in order to sum
>> spectra together. I will let you know if and how I solve this
>> problem if it is of any intereset.
>> AC
>
> The leasqr wrapper I mentioned can handle multiple overlapping
> Gaussians.  You might wonder, for instance, whether a fit to two
> unresolved peaks gives a smaller chi-squared per degree of freedom
> than a fit to a single peak.  This is what the "demo" does for a
> dodgy problem with two exponentials.  (Though you have to find the
> chi2 yourself, sum( ((y-f5)./errscale).^2 ), after the demo runs,
> because I wasn't thinking of this when I wrote it).
>
> If you have some constant background you'll have to subtract it by
> hand for now.
>
> code, again, at
>        http://sns.phys.utk.edu/~mahurin/octave/
>
> Cheers,
> Rob
>
> --
> Rob Mahurin
> Dept. of Physics & Astronomy
> University of Tennessee         phone: 865 207 2594
> Knoxville, TN 37996             email: address@hidden
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 24 Sep 2008 11:40:21 -0400
> From: "John W. Eaton" <address@hidden>
> Subject: Re: strange regexp behavior
> To: David Bateman <address@hidden>
> Cc: address@hidden, "G.." <address@hidden>
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=us-ascii
>
> On 23-Sep-2008, David Bateman wrote:
>
> | Ok, then what about the attached changeset for 3.1.51+ based on your
> | patch that
> |
> | * Adds a call to OCTAVE_QUIT
> | * Adds the loop counter to terminate for truly infinitely recursive patterns
> | * Adds a test based on the previously failing code.
> |
> | I compiled and tested this sucessfully with 3.1.51+ and suppose it will
> | work for 3.0.2+ as well.
>
> I applied it.
>
> Thanks,
>
> jwe
>
>
> ------------------------------
>
> Message: 4
> Date: Thu, 25 Sep 2008 00:20:13 +0800
> From: LUK ShunTim <address@hidden>
> Subject: Returned value from function as a global variable
> To: address@hidden
> Message-ID: <address@hidden>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
>
> I had some matlab code which uses global variables to allow common
> access to returned values from functions. It appears that octave doesn't
> allow such behaviour. Here's a short function which produces an error in
> octave.
>
> function [v]=t_global_f(x)
>    global v;
>    v = sin(x);
> endfunction
>
> octave:1> x=0:0.1:pi;
> octave:2> v=t_global_f(x);
> error: can't make function parameter `v' global
> error: evaluating global command near line 6, column 1
> error: called from `t_global_f' in file
> `/home/0/00work/octave/00snippets/t_global_f.m'
> error: evaluating assignment expression near line 2, column 2
>
> Is there any plan to implement the same behaviour in octave?
>
> Regards,
> ST
> --
>
>
>
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>
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> End of Help-octave Digest, Vol 30, Issue 65
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>