Menu
▾
▴
octave-dev
|
From: Etienne G. <et...@is...> - 2002-08-10 17:27:51
Attachments:
inline.m
|
Hello again,
On Sat, Aug 10, 2002 at 01:32:42PM +0000, Steffan Berridge wrote:
#=20
# Hi,
#=20
# I have just started using Octave, having used Matlab for a
# while. In Matlab I have often used inline functions, they
# are very convenient for example when passing a function as
# an argument.
#=20
# For example, the following is a function returning the
# square of the argument:
#=20
# fun =3D inline('x^2','x');
Try the attached m-file, called inline.m.
Is that, or something alike, worthy of octave-forge?
Cheers,
Etienne
=20
# One can then pass this function as an argument to another
# function:
#=20
# x =3D foo(fun,...);
#=20
# So my question is, is there an equivalent construction in
# Octave? If not, what is the best way to pass functions as
# arguments?
#=20
# Thanks,
# Steffan
#=20
#=20
#=20
#=20
# -------------------------------------------------------------
# Octave is freely available under the terms of the GNU GPL.
#=20
# Octave's home on the web: http://www.octave.org
# How to fund new projects: http://www.octave.org/funding.html
# Subscription information: http://www.octave.org/archive.html
# -------------------------------------------------------------
#=20
#=20
#=20
#=20
# =00=00=00=00=00=00=00=00=00
--=20
Etienne Grossmann ------ http://www.isr.ist.utl.pt/~etienne
|
|
From: Etienne G. <et...@is...> - 2002-08-10 17:31:21
Attachments:
inline.m
|
Sorry, there was a part missing from the first attached func. Try
the following.
Etienne
On Sat, Aug 10, 2002 at 01:32:42PM +0000, Steffan Berridge wrote:
#
# Hi,
#
# I have just started using Octave, having used Matlab for a
# while. In Matlab I have often used inline functions, they
# are very convenient for example when passing a function as
# an argument.
#
# For example, the following is a function returning the
# square of the argument:
#
# fun = inline('x^2','x');
#
# One can then pass this function as an argument to another
# function:
#
# x = foo(fun,...);
#
# So my question is, is there an equivalent construction in
# Octave? If not, what is the best way to pass functions as
# arguments?
#
# Thanks,
# Steffan
--
Etienne Grossmann ------ http://www.isr.ist.utl.pt/~etienne
|
|
From: Paul K. <pki...@ja...> - 2002-08-10 20:04:42
|
Sure. Add it to octave forge. I simplified the while loop a bit, and let
you use a default parameter of "x". I wouldn't go much beyond this in
terms of compatibility --- too many assumptions required about what makes a
variable and what order the variables should go in. Maybe inline(expr,n) as
shorthand for inline(expr,"x","P1","P2",...,"Pn") is useful.
Paul Kienzle
pki...@us...
On Sat, Aug 10, 2002 at 06:37:46PM +0100, Etienne Grossmann wrote:
>
> Sorry, there was a part missing from the first attached func. Try
> the following.
>
> Etienne
>
> On Sat, Aug 10, 2002 at 01:32:42PM +0000, Steffan Berridge wrote:
> #
> # Hi,
> #
> # I have just started using Octave, having used Matlab for a
> # while. In Matlab I have often used inline functions, they
> # are very convenient for example when passing a function as
> # an argument.
> #
> # For example, the following is a function returning the
> # square of the argument:
> #
> # fun = inline('x^2','x');
> #
> # One can then pass this function as an argument to another
> # function:
> #
> # x = foo(fun,...);
> #
> # So my question is, is there an equivalent construction in
> # Octave? If not, what is the best way to pass functions as
> # arguments?
> #
> # Thanks,
> # Steffan
> --
> Etienne Grossmann ------ http://www.isr.ist.utl.pt/~etienne
## [fname,fcode] = inline (str,arg1,...) - Define a function from a string
##
## INPUT : -----------
## str : string : String defining the result of the function
## argN : string(s) : Names of the arguments of the function
##
## OUTPUT : ----------
## fname : string : Name of the new function, which can e.g. be called w/
## feval()
## fcode : string : The code of the function
##
## EXAMPLE : ---------
##
## fn = inline ("x.^2 + 1","x");
## feval (fn, 6)
## ans = 36
##
function [fname,fcode] = inline (str,varargin)
## Choose a name (naive way : won't work zillions of times)
while 1
fname = sprintf ("inline_func_%06i",floor (rand()*1e6));
if exist (fname), break; end
end
## construct arg list
if nargin == 1
argstr = "x";
else
argstr = sprintf ("%s,",all_va_args);
argstr = argstr(1:length(argstr)-1);
end
fcode = sprintf (["function r = %s (%s)\n",\
" r = ",str,";\n",\
"endfunction;"],\
fname, argstr);
eval (fcode);
endfunction
|
|
From: Etienne G. <et...@is...> - 2002-08-11 15:05:04
|
Hello,
On Sat, Aug 10, 2002 at 04:04:24PM -0400, Paul Kienzle wrote:
# Sure. Add it to octave forge. I simplified the while loop a bit, and let
Good, but "if ! exist (fname), break; endif" is better.
# you use a default parameter of "x". I wouldn't go much beyond this in
# terms of compatibility --- too many assumptions required about what makes a
# variable and what order the variables should go in. Maybe inline(expr,n) as
# shorthand for inline(expr,"x","P1","P2",...,"Pn") is useful.
Or "x1", "x2", ... ? Does Matlab do such a thing? I would keep it as
it is. I'll check in your version w/ "x" as default but won't do more
refinements.
Cheers,
Etienne
# Paul Kienzle
# pki...@us...
#
# On Sat, Aug 10, 2002 at 06:37:46PM +0100, Etienne Grossmann wrote:
# >
# > Sorry, there was a part missing from the first attached func. Try
# > the following.
# >
# > Etienne
# >
# > On Sat, Aug 10, 2002 at 01:32:42PM +0000, Steffan Berridge wrote:
# > #
# > # Hi,
# > #
# > # I have just started using Octave, having used Matlab for a
# > # while. In Matlab I have often used inline functions, they
# > # are very convenient for example when passing a function as
# > # an argument.
# > #
# > # For example, the following is a function returning the
# > # square of the argument:
# > #
# > # fun = inline('x^2','x');
# > #
# > # One can then pass this function as an argument to another
# > # function:
# > #
# > # x = foo(fun,...);
# > #
# > # So my question is, is there an equivalent construction in
# > # Octave? If not, what is the best way to pass functions as
# > # arguments?
# > #
# > # Thanks,
# > # Steffan
# > --
# > Etienne Grossmann ------ http://www.isr.ist.utl.pt/~etienne
#
# ## [fname,fcode] = inline (str,arg1,...) - Define a function from a string
# ##
# ## INPUT : -----------
# ## str : string : String defining the result of the function
# ## argN : string(s) : Names of the arguments of the function
# ##
# ## OUTPUT : ----------
# ## fname : string : Name of the new function, which can e.g. be called w/
# ## feval()
# ## fcode : string : The code of the function
# ##
# ## EXAMPLE : ---------
# ##
# ## fn = inline ("x.^2 + 1","x");
# ## feval (fn, 6)
# ## ans = 36
# ##
# function [fname,fcode] = inline (str,varargin)
#
# ## Choose a name (naive way : won't work zillions of times)
# while 1
# fname = sprintf ("inline_func_%06i",floor (rand()*1e6));
# if exist (fname), break; end
# end
#
# ## construct arg list
# if nargin == 1
# argstr = "x";
# else
# argstr = sprintf ("%s,",all_va_args);
# argstr = argstr(1:length(argstr)-1);
# end
#
# fcode = sprintf (["function r = %s (%s)\n",\
# " r = ",str,";\n",\
# "endfunction;"],\
# fname, argstr);
# eval (fcode);
# endfunction
#
#
#
--
Etienne Grossmann ------ http://www.isr.ist.utl.pt/~etienne
|
|
From: Julius S. <jo...@cc...> - 2008-12-06 22:47:45
|
<html> <body> <font size=3>Hi All,<br><br> In trying to 'make all' in the latest octave-forge repo working copy on Mac OS X (Macbook Pro), I got a hang at<br><br> Making html comms.html<br> [indefinite hang]<br><br> Drilling down I found that /usr/bin/texi2html was hanging. I happened to have another one in /opt/local/bin (presumably installed via 'port install texi2html' or 'port install tetex' or the like), and that fixed it. I made the following change in Makeconf:<br><br> #TEXI2HTML = /usr/bin/texi2html -split_chapter -number<br> TEXI2HTML = /opt/local/bin/texi2html -split_chapter -number<br><br> </font>and now the build is proceeding.<br><br> Julius<br><br> <br> <x-sigsep><p></x-sigsep> <font size=4>"Anybody who knows all about nothing knows everything" -- Leonard Susskind<br> </font></body> </html> |
×
Want the latest updates on software, tech news, and AI?
Get latest updates about software, tech news, and AI from SourceForge directly in your inbox once a month.
Thanks for helping keep SourceForge clean.
X