from the ECE department...
Conversting a Matlab M- file to c
 Posted by NA on 23 June, 2012 - 1:25 pm
Hello

i am new user of Matlab and c. but i am taking a project of control system toolbox and i need to convert M-file to c and i don't know how it can be. Please would you let me know is there any converter or any other method to convert it?
`This  is my m-file:-function [Phi, Gamma] = c2d(a, b, t)%C2D  Conversion of continuous-time models to discrete time.%%   SYSD = C2D(SYSC,Ts,METHOD) converts the continuous-time LTI %   model SYSC to a discrete-time model SYSD with sample time Ts.  %   The string METHOD selects the discretization method among the %   following:%      'zoh'       Zero-order hold on the inputs%      'foh'       Linear interpolation of inputs (triangle appx.)%      'imp'       Impulse-invariant discretization%      'tustin'    Bilinear (Tustin) approximation%      'prewarp'   Tustin approximation with frequency prewarping.  %                  The critical frequency Wc (in rad/sec) is specified%                  as fourth input by %                     SYSD = C2D(SYSC,Ts,'prewarp',Wc)%      'matched'   Matched pole-zero method (for SISO systems only).%   The default is 'zoh' when METHOD is omitted.%%   For state-space models without delays, %      [SYSD,G] = C2D(SYSC,Ts,METHOD)%   also returns the matrix G mapping the states xc(t) of SYSC to%   the states xd[k] of SYSD:%      xd[k] = G * [xc(k*Ts) ; u[k]]%   Given some initial condition x0 for SYSC, an equivalent initial %   condition for SYSD is%      xd[0] = G * [x0;u0]%   where u0 is the initial input value.%%   See also D2C, D2D, LTIMODELS.%Other syntax%C2D	Conversion of state space models from continuous to discrete time.%	[Phi, Gamma] = C2D(A,B,T)  converts the continuous-time system:%		.%		x = Ax + Bu%%	to the discrete-time state-space system:%%		x[n+1] = Phi * x[n] + Gamma * u[n]%%	assuming a zero-order hold on the inputs and sample time T.%%	See also D2C.%	J.N. Little 4-21-85%   Copyright 1986-2007 The MathWorks, Inc.%	\$Revision: 1.1.8.3 \$  \$Date: 2007/11/09 19:48:35 \$error(nargchk(3,3,nargin));error(abcdchk(a,b));[m,n] = size(a);[m,nb] = size(b);s = expm([[a b]*t; zeros(nb,n+nb)]);Phi = s(1:n,1:n);Gamma = s(1:n,n+1:n+nb);% end c2d`

 Posted by Gerrit on 27 June, 2012 - 4:37 am
NA,

If you want to convert MATLAB code to C and use built-in MATLAB functions like 'expm(...)', I think your only option is to use a code generation tool like MathWorks' own "MATLAB Coder":

http://www.mathworks.co.uk/products/matlab-coder/

There may be other tools such as dSpace's TargetLink (I have no experience with these):

http://www.dspace.com/en/ltd/home/products/sw/pcgs/targetli.cfm

Neither of these two tools is cheap; please let us all know if you do come across a free or cheaper tool.

Generation of C code from LabView instead of MATLAB may be easier; have you considered using LabView as your design/development tool?

Regards,
Gerrit.

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