Declare 'eval' function in Embedded MATLAB
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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.
采纳的回答
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
and then you would invoke
fa = f(x, n);
fb = f(x, n);
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