CMEX

Thread View: comp.soft-sys.matlab

2 messages

[T] Back to Threads [V] Tree View [G] Group Articles

2 total messages Started by Todd Vernon Mon, 25 Jan 1993 21:13

#59

Author: Todd Vernon
Date: Mon, 25 Jan 1993 21:13

27 lines
1592 bytes

Our site uses Matlab 3.0 and now is moving to 4.0.  We have
a few CMEX programs we generated to load large files containing
time history data sets. 

Due to the way Matlab handles CMEX interaction, ( all passed 
back data must be in a left hand argument),  this makes it
very difficult to load data sets with unknown number or
matrices.

Our data is mostly vector data, so what we do is pass back
2 left hand args, one that contains all our 1-by-n vectors 
packed into one matrix, and the other a matrix of characters
that make up each vector name.  After words, we have a m-file
that breaks apart each seperate vector putting it in a matlab
variable by the name in the other matix.  What a PAIN.  

Are we missing something here.   We really need a way to create
matrices as we load the data and not have our hands tied by
having to pass them back through left hand args.  

This really hinders our ability to access the data we need to 
get to, any suggestions.  Changing data format is NOT an option.

Thanks in advance.


-todd :  todd@fred.dfrf.nasa.gov

Re: CMEX

#99

Author: John Little
Date: Wed, 27 Jan 1993 00:21

34 lines
1778 bytes

In article <1993Jan25.211337.5466@news.dfrf.nasa.gov> Todd Vernon,
todd@fred.dfrf.nasa.gov writes:
>Our site uses Matlab 3.0 and now is moving to 4.0.  We have
>a few CMEX programs we generated to load large files containing
>time history data sets. 
>
>Due to the way Matlab handles CMEX interaction, ( all passed 
>back data must be in a left hand argument),  this makes it
>very difficult to load data sets with unknown number or
>matrices.
>
>Our data is mostly vector data, so what we do is pass back
>2 left hand args, one that contains all our 1-by-n vectors 
>packed into one matrix, and the other a matrix of characters
>that make up each vector name.  After words, we have a m-file
>that breaks apart each seperate vector putting it in a matlab
>variable by the name in the other matix.  What a PAIN.  
>
>Are we missing something here.   We really need a way to create
>matrices as we load the data and not have our hands tied by
>having to pass them back through left hand args.  
>
>This really hinders our ability to access the data we need to 
>get to, any suggestions.  Changing data format is NOT an option.
>
>Thanks in advance.


The MEX-file facility in MATLAB 4.0 includes a new routine called
mexPutMatrix that allows you to plop a matrix directly back into 
the MATLAB workspace.


John Little

Thread Navigation

This is a paginated view of messages in the thread with full content displayed inline.

Messages are displayed in chronological order, with the original post highlighted in green.

Use pagination controls to navigate through all messages in large threads.

Back to All Threads