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Hi MaplePrimers!

I have a simulation in MapleSIM, exported as a compiled procedure in maple using -LinkModel(), and -GetCompiledProc.

I'm trying to do parameter estimation on my MapleSIM model.  Within a optimization scheme, I call the MapleSIM model, and it will output a curve.  Using a least squares method, I compare this measurements to synthetic experimental data (I know the actual values), and generate an objective function.  The optimization algorithm will try different parameter values, and try to minimze the objective function.  When the curves are exactly the same, the objective function will be zero.

The problem I am having is certain parameter sets will cause the model to require very small steps.  I wish to put a timeout on these experiments, because speed is important.  However, I would also like to see the results up to the point of requiring very small steps.  For timeout, I was using code along the lines of:

out:= timelimit(30,cProc(params = PData)); #simulate with 30s limit

where PData are the parameter guessses, and cProc is the compiled MapleSim model.

I would like 'out' to be assigned whatever the results were after 30 seconds, even if the model had not finished integrating.

 

Thanks in advance for any help!

Hello!  Hoping that Maple 16 is now better with function compilation, I have compiled the rather simple function that returns the complex value.  As I understand from the code below, Maple automatically assumes the arguments to be complex.  That's fine.

The compiler gcc gives some errors:

/var/tmp/sergey-2181/_m71f6dec6b3c75a742676f2dcb3fa1864.c: In function ‘_c71f6dec6b3c75a742676f2dcb3fa1864’:
/var/tmp/sergey-2181/_m71f6dec6b3c75a742676f2dcb3fa1864...

stopping computation...

September 26 2012 carranty83 15

Is there a way to stop maple at a particluar line in a worksheet> I frequently have to compile my worksheet from the beginning up to whatever line I'm writing on (which may be in the middle of the file).  RIght now I'm highlighting all lines above my current one and clicking the ! symbol.  Is there a command I can type, which will allow me to click on the !!! button but will stop computation at the line on which the command is written? Continuously highlighting...

Hello,

 

I have to design a wheeled mobile robot for my bachelor-thesis. the robot should be controlled in Simulink. Therefore, I have to use the Simulink Component Block Generator. Outputs are: yaw angle/rate, absolute position in x/z and its derivatives, wheel angle and its derivative,steering angle. Inputs are one torque for steering and one torque for actuatuating for each wheel. -->6 torques (3 wheels). When I click on the "Generate and Compile...

Question is very simple:

if I write square root as  f^(1/2) , then the compile function gives a error: 

Error, (in Print) rational numbers and arithmetic are not yet supported

if I write it as sqrt(f) then compile works.

But Maple seems to internally always convert sqrt(f) to f^(1/2). So, I am constantly getting the above error!

Is there a workaround? I have an impression of very poorly written Compile function....

Hello!

I have a strange issue:   I have a procedure with signum, square roots, I and float numbers. First I optimize it and then compile.  (or just run compile with option optimize=true).  As a result I get a error:

Error, (in TargetLanguageTools:-GetExprType) Analysis is not a command in the _EnvCGEngine package

Trying to understand, what is happening, I manually copy-paste the optimised procedure to the argument of compile. Then it works!!!

Hi all,

I'm currently running a parameter space search via Maple scripting. The pseudo-code goes something like this:

 

fopen text file to write data to;

initialize parameters (variable) x, y, and z;

for x number of iterations

   A:-Simulate(model.msim, with [parameters]);

   Update parameters with new values;

   Write to text file;

end do;

fclose(text file)

Wide set of expressions can convert to compiled functions. Expressions can even include definite integrals.
Hope it helps for others who want really speedup calculations in maple as much as possible for now.

ex.mw

 

Checked under 15.01 version

How to do subj? Straightforward way doesn't compile:

restart;

myint:= proc(u::float)::float;
return int(exp(x^6), x=0.0..u);
end proc:


createcomp:=proc (expr::evaln, exprfunc::evaln);
exprfunc:=(v::float)->unapply(evaln(expr),a)(v);
return Compiler:-Compile(exprfunc,optimize);
end proc:
global_expr:=myint(a)+a^a;
s:=createcomp(global_expr, global_exprfunc);


"Error, (in Print) cannot translate value of lexically...

doesnt compiled...

November 21 2011 icegood 265

ggg:=(y,a,b)->
(2*(-a+6*y^2*a^2+2*b*y^2*a^2+9*b*y^3*a+3*b*y^2*a+b*y^6*a^2+4*b*y^5*a^2+5*b*y^4*a^2+2*b*y^5*a+8*b*y^4*a+3*b*y^3*a^2+4*b*y^2-y^3*a-3*y^2*a+y^6*a^3+5*y^5*a^3+8*y^4*a^3+4*y^3*a^3+y^5*a^2+5*y^4*a^2+9*y^3*a^2+b*y^4+4*b*y^3+y*a^2+2*a*b*y+y^3*a*(y+1)^(-2*b)+a*(y+1)^(-2*b)+3*y^2*a*(y+1)^(-2*b)+3*y*a*(y+1)^(-2*b)-2*y^2*a^2*(y+1)^(-2*b)-y*a^2*(y+1)^(-2*b)-3*y*a-y^3*a^2*(y+1)^(-2*b))/(y^2*(a+b)*(y+1)*(y+2)^2*(y*a+1)^2)+(-2-y^2+2*y^2*a^2-2*y+4*b*y^3*a+8*b*y^2*a+2*b*y^4*a^2+4*b*y^3*a^2...

tryed to compile samples\OpenMaple\cmaple\omexample.c in MS Visual C++ Express 2010. Everything is OK but after running is writes "The program can't start because maplec.dll is missing from your computer..." Why? I've linked maplec.lib statically! Besides \Maple\bin.win\ in my library path where both maplec.dll and maplec.lib are. System - Win7 Home Premium +SP1

And so with this provocative title, "pushing dsolve to its limits" I want to share some difficulties I've been having in doing just that. I'm looking at a dynamic system of 3 ODEs. The system has a continuum of stationary points along a line. For each point on the line, there exist a stable (center) manifold, also a line, such that the point may be approached from both directions. However, simulating the converging trajectory has proven difficult.

I have simulated as...

Using the Open Maple application program interface (API), the ExternalCalling module, a C compiler, and some basic understanding of the Maple data structure format, you can create Maple utilities that run nearly as fast as Maple builtin procedures.

To show how this is done, I will start with a simple example and then proceed to a slightly more complex procedure that improves ?ListTools[SearchAll]

The Maple ?Compiler can compile a limited subset of Maple commands to native code. The result is substantially faster than running interpreted Maple code. This article shows how you can save a compiled procedure for reuse.

When a Maple procedure is compiled, a shared object library (dynamic-linked library for Windows) is created on the file system, as a temporary file.  When the Maple...

Hello there,  How can I compile this? I used   boundarycompiled := Compiler:-Compile(findboundary)    but this didnt work. Thanks in advance

 

> findboundary:=proc(a,b,c,d,e,f,g,h)  ;
> global A,B,lowerbound,upperbound;
> A, B := solve(a = b, x), solve(c = b, x);
> x1a, x1b := evalf(solve((x-e)^2+(a-f)^2-g^2)); if x1a < x1b then minx1, maxx1 := x1a, x1b else minx1, maxx1 := x1b, x1a end if;
> x2a, x2b := evalf(solve((x-e...

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