MATLAB Central Newsreader - MEX EXAMPLE not working .. URGENT please

MEX EXAMPLE not working .. URGENT please

Charan — Tue, 19 Feb 2008 22:37:03 -0500

I am a newbie to MEX functions.
I got Fortran 9.1 and selected it using "mex -setup"

then i tried to compile the example in this link

http://www.mathworks.com/access/helpdesk/help/techdoc/index.
html?/access/helpdesk/help/techdoc/matlab_external/f21779.ht
ml&http://www.google.com/search?
hl=en&q=mex+fortran+sample+code

But I get an error. what should I do?

the error I get is as follows

>> mex timestwo.f
ifort: Command line warning: /fp:precise evaluates in
source precision with Fortran.
fortcom: Error: Illegal character in statement label field
[m]
fortcom: Error: Illegal character in statement label field
[e]
fortcom: Error: Illegal character in statement label field
[x]
fortcom: Error: Illegal character in statement label field
[t]
fortcom: Error: First statement in file must not be
continued
timestwo.f(1) : Error: Syntax error, found POUND_BASE ''
when expecting one of: => = / . ( :: , <END-OF-
STATEMENT> ; : ) %
mex timestwo.F#include "fintrf.h"
--------------^
timestwo.f(21) : Error: Syntax error, found ',' when
expecting one of: => = . ( %
      mwpointer plhs(*), prhs(*)
-----------------------^
timestwo.f(22) : Error: Syntax error, found ',' when
expecting one of: => = . ( : %
      mwpointer mxGetPr, mxCreateDoubleMatrix
-----------------------^
timestwo.f(23) : Error: Syntax error, found ',' when
expecting one of: => = . ( : %
      mwpointer x_pr, y_pr
--------------------^
timestwo.f(28) : Error: Syntax error, found ',' when
expecting one of: => = . ( : %
      mwsize mxGetM, mxGetN
-------------------^
timestwo.f(29) : Error: Syntax error, found ',' when
expecting one of: => = . ( : %
      mwsize m, n, size
--------------^
timestwo.f(27) : Error: A specification statement cannot
appear in the executable section.
      integer nlhs, nrhs, mxIsNumeric
------^
timestwo.f(29) : Error: A specification statement cannot
appear in the executable section.
      mwsize m, n, size
------^
timestwo.f(30) : Error: A specification statement cannot
appear in the executable section.
      real*8 x, y
------^
timestwo.f(21) : Error: Object is not a pointer object
[MWPOINTERPLHS]
      mwpointer plhs(*), prhs(*)
------^
timestwo.f(22) : Error: The POINTER attribute is required
[MWPOINTERMXGETPR]
      mwpointer mxGetPr, mxCreateDoubleMatrix
------^
timestwo.f(22) : Error: The variable must have the TARGET
attribute or be a subobject of an object with the TARGET
attribute, or it must have the POINTER attribute.
[MXCREATEDOUBLEMATRIX]
      mwpointer mxGetPr, mxCreateDoubleMatrix
-------------------------^
timestwo.f(23) : Error: The POINTER attribute is required
[MWPOINTERX_PR]
      mwpointer x_pr, y_pr
------^
timestwo.f(23) : Error: The variable must have the TARGET
attribute or be a subobject of an object with the TARGET
attribute, or it must have the POINTER attribute. [Y_PR]
      mwpointer x_pr, y_pr
----------------------^
timestwo.f(28) : Error: The POINTER attribute is required
[MWSIZEMXGETM]
      mwsize mxGetM, mxGetN
------^
timestwo.f(28) : Error: The variable must have the TARGET
attribute or be a subobject of an object with the TARGET
attribute, or it must have the POINTER attribute.
[MXGETN]
      mwsize mxGetM, mxGetN
---------------------^
timestwo.f(41) : Error: This name has not been declared as
an array or a function. [MXGETN]
      n = mxGetN(prhs(1))
----------^
timestwo.f(50) : Error: This name has not been declared as
an array or a function. [PLHS]
      plhs(1) = mxCreateDoubleMatrix(m,n,0)
------^
timestwo.f(50) : Error: This name has not been declared as
an array or a function. [MXCREATEDOUBLEMATRIX]
      plhs(1) = mxCreateDoubleMatrix(m,n,0)
----------------^
compilation aborted for timestwo.f (code 1)

  C:\PROGRA~1\MATLAB\R2007B\BIN\MEX.PL: Error: Compile
of 'timestwo.f' failed.

Re: MEX EXAMPLE not working .. URGENT please

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) — Tue, 19 Feb 2008 22:46:14 -0500

In article <fpflmf$6nl$1@fred.mathworks.com>,
Charan <boyacharan@gmail.com> wrote:
>I am a newbie to MEX functions.
>I got Fortran 9.1 and selected it using "mex -setup"

>then i tried to compile the example in this link

>http://www.mathworks.com/access/helpdesk/help/techdoc/index.
>html?/access/helpdesk/help/techdoc/matlab_external/f21779.ht
>ml&http://www.google.com/search?
>hl=en&q=mex+fortran+sample+code

>But I get an error. what should I do?

>the error I get is as follows

>>> mex timestwo.f

>timestwo.f(1) : Error: Syntax error, found POUND_BASE ''
>when expecting one of: => = / . ( :: , <END-OF-
>STATEMENT> ; : ) %
>mex timestwo.F#include "fintrf.h"

Please check the content of timestwo.f . Somehow the compiler
is seeing C code, not Fortran code.
--
"I will not approve any plan which is based on the old principle
of build now and repair later." -- Walter Hickle

Re: MEX EXAMPLE not working .. URGENT please

James Tursa — Wed, 20 Feb 2008 00:33:07 -0500

roberson@ibd.nrc-cnrc.gc.ca (Walter Roberson) wrote in
message <fpfm7m$24q$1@canopus.cc.umanitoba.ca>...
>
> Please check the content of timestwo.f . Somehow the
compiler
> is seeing C code, not Fortran code.

No. The mwpointer stuff is definitely Fortran, not C. I
will go check my version of timestwo.f and try compiling
it with Intel 9.1 ....

James Tursa

Re: MEX EXAMPLE not working .. URGENT please

James Tursa — Wed, 20 Feb 2008 00:49:08 -0500

timestwo.F works fine for my R2007a and Intel 9.1. It may
be that you are using an older version of MATLAB where the
header file fintrf.h does not define mwpointer or mwsize
(they used to be just integer*4). So after the
#include "fintrf.h" line, add these lines:

#ifndef mwpointer
#define mwpointer integer*4
#endif

#ifndef mwsize
#define mwsize integer*4
#endif

That way, if they are not defined then your code will
define them before using them.

James Tursa

Re: MEX EXAMPLE not working .. URGENT please

James Tursa — Wed, 20 Feb 2008 01:21:11 -0500

"James Tursa" <aclassyguywithaknotac@hotmail.com> wrote in
message <fpfte4$a1j$1@fred.mathworks.com>...
>
> timestwo.F works fine for my R2007a and Intel 9.1. It
may
> be that you are using an older version of MATLAB where
the
> header file fintrf.h does not define mwpointer or mwsize
> (they used to be just integer*4). So after the
> #include "fintrf.h" line, add these lines:
>
> #ifndef mwpointer
> #define mwpointer integer*4
> #endif
>
> #ifndef mwsize
> #define mwsize integer*4
> #endif
>
> That way, if they are not defined then your code will
> define them before using them.
>
> James Tursa
>

Follow-up: The code works, but only if the input is a
scalar. The code has bugs for other sizes. In particular,
this line:

call mxCopyPtrToReal8(x_pr,x,size)

will cause memory beyond x (which is only one element with
8 bytes) to be overwritten with whatever x_pr is pointing
to. Something is being clobbered here, and this will cause
unpredictable results.

Also, from a good practise standpoint, "size" should not
be used as a variable name since it is the name of a
Fortran intrinsic function.

James Tursa