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From: sunil koundinya on 18 Mar 2010 06:14
HI, I am in need of help urgently....in my program there is a need of getting a variable in MATLAB into C...how is it possible??? Actually filter Coefficients are calculated in MATLAB using FIR1 and later this coefficients are used in C program to design the filter..So please help me how can i pass this variable into C??please state even an example if it is available..
From: Rune Allnor on 18 Mar 2010 06:20
On 18 Mar, 11:14, "sunil koundinya" <sunil222sup...(a)yahoo.co.in>
wrote:
> HI, I am in need of help urgently....in my program there is a need of getting a variable in MATLAB into C...how is it possible??? Actually filter Coefficients are calculated in MATLAB using FIR1 and later this coefficients are used in C program to design the filter..So please help me how can i pass this variable into C??please state even an example if it is available..

If you design your filter in matlab and want to use the
coefficients in a C program, the by far simplest way to
move the numbers is a good old copy - paste.

If you are going to design several filters, so you need
to do this many times, just dump the coefficients to a
text file and read it from the C program.

Rune
From: Wayne King on 18 Mar 2010 06:42
"sunil koundinya" <sunil222superb(a)yahoo.co.in> wrote in message <hnsudc$bmg$1(a)fred.mathworks.com>...
> HI, I am in need of help urgently....in my program there is a need of getting a variable in MATLAB into C...how is it possible??? Actually filter Coefficients are calculated in MATLAB using FIR1 and later this coefficients are used in C program to design the filter..So please help me how can i pass this variable into C??please state even an example if it is available..

Hi Sunil, there are a couple of options off the top of my head:

1.) If you have the Real-Time Workshop, you can generate C code using the fir1() function. fir1() is part of the subset of Signal Processing Toolbox functions that are supported by Embedded Matlab. See the Signal Processing Toolbox User's Guide for a complete list and examples on usage.

2.) You can write your C program and use the MATLAB output (the filter coefficients from fir1())
directly in the C code

ex:

b=fir1(10,0.2); %coefficients returned and used in C program

in C

static real B[11] = { 7.3914231509637267E-019, 9.3042831450181451E-003,
4.7577766134417450E-002, 1.2236354636114467E-001,
2.0224655842984032E-001, 2.3701569185915902E-001, 2.0224655842984032E-001,
1.2236354636114467E-001, 4.7577766134417450E-002, 9.3042831450181451E-003,
7.3914231509637267E-019 };


Wayne
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