Declare 'eval' function in Embedded MATLAB

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Tong-Seop
Tong-Seop 2011-3-4
I made a secant method for complicated equation in MATLAB edit space. Like this... Function y = fcn(st, cq, a, g, ...) f=''3600 * st * cq * a * ((((2 * g * gam * pi)..........'; (Flow Function eq)
Of course, there is simple secant method.
n=0; x = xa; fa = eval(f); x = xb; fb = eval(f); .......
and then I put this script in Embedded MATLAB of Simulink. For 'eval' function, I also put 'eml.extrinsic('eval') in it.
When I start the simulation, I could see an error *"Call to MATLAB function aborted : Error using ==> eval Undefined function or variable 'st'."*
Thanks for your help.

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Walter Roberson
Walter Roberson 2011-3-4
And does "st" indeed exist in your matlab workspace at the time? When you construct a string like that, the current value of the variable is not recorded.
If it is allowed on embedded systems, you would be better of constructing f as an anonymous function
f = @(x,n) 3600 * st * cq etc
and then you would invoke
fa = f(x, n);
fb = f(x, n);
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Tong-Seop
Tong-Seop 2011-3-4
st, cq... are input data from simulink.
Thanks for your kindness.
But I'm not sure that the anonymous function (you made) is possible in embedded matalb.
But thanks, it helped.

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