Originally posted by: Jutto

Hello

I am still having problems solving the integration of a trigonometric function in a variable expression.
This is what I am trying: Since mathematical functions do not work for variable expressions, I am trying to pre-calculate sine and cosine functions of all 360 angle degrees in a execution block and then call their results, based on the dvar angle, in a dexpr definition for line length calculation.

For the last two dexpr (linex and liney), the software indicates the following mistake: Cannot use type floatrange for userFunction.

How can I get around this?
This is some part of the current code:

using CP; ... 

int numPoints = 5; 

int nP = numPoints; 

int boundx = 10; 

int boundy = 8; 

int dia = 12;   

float Sine[0..359]; 

float Cosine[0..359];   range Points         = 1..nP;   dvar 

int x0 in 0..boundx; dvar 

int y0 in 0..boundy; dvar 

int line[Points]    in 0..dia; dvar 

int alpha[Points]  in 0..359;   ... dexpr 

float Perimeter                = (sum (p in Points)(abs(line[p])));   dexpr 

float linex[p in Points]     = (line[p]*Cosine(alpha)); dexpr 

float liney[p in Points]      = (line[p]*Sine(alpha));   execute CalcCoSine 
{ 

for (var d=0;d<360;d++) 
{ Sine[d]   = Math.sin (d*Math.PI/180) Cosine[d] = Math.cos (d*Math.PI/180) writeln (Sine[d],Cosine[d]) 
} 
};

Thanks.
#ConstraintProgramming-General
#DecisionOptimization

Originally posted by: ol

Hello,

there were two problems in your code: missing parameter and "()" instead ot "[]":
using CP;

int numPoints = 5;
int nP = numPoints;
int boundx = 10;
int boundy = 8;
int dia = 12;

float Sinehttp://0..359;
float Cosinehttp://0..359;

range Points = 1..nP;

dvar int x0 in 0..boundx;
dvar int y0 in 0..boundy;
dvar int linePoints in 0..dia;
dvar int alphaPoints in 0..359;

dexpr float Perimeter = (sum (p in Points)(abs(line[p])));

dexpr float linexp in Points = (line[p]*Cosine[alphap]);
dexpr float lineyp in Points = (line[p]*Sine[alphap]);

execute CalcCoSine {
for (var d=0;d<360;d++) {
Sine[d] = Math.sin (d*Math.PI/180)
Cosine[d] = Math.cos (d*Math.PI/180)
writeln (Sine[d],Cosine[d])
}
};
Regards,
Olivier
#ConstraintProgramming-General
#DecisionOptimization

Originally posted by: ol

sorry, the forum doesn't like the [].
Should be more readable:

dexpr float linex[p in Points] = (line[p]*Cosine[alpha[p]]);
dexpr float liney[p in Points] = (line[p]*Sine[alpha[p]]);

Olivier
#ConstraintProgramming-General
#DecisionOptimization

Originally posted by: Jutto

Thanks a lot, Olivier.
#ConstraintProgramming-General
#DecisionOptimization