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CodeGeneration[C] - translate Maple code to C code

Calling Sequence

C(x, cgopts)

Parameters

x

-

expression, list, rtable, procedure or module

cgopts

-

(optional) one or more CodeGeneration options

Description

• 

The C command translates Maple code to ANSI C code.

  

- If the parameter x is an algebraic expression, then a C statement assigning the expression to a variable is generated.

  

- If x is a list, rtable or Maple Array of algebraic values, then a sequence of C statements assigning the elements to a C array is produced.  Only the initialized elements of the rtable or Maple Array are translated.

  

- If x is a list of equations nm=expr where nm is a name and expr is an algebraic expression, this is understood to mean a sequence of assignment statements.  In this case, the equivalent sequence of C assignment statements is generated.

  

- If x is a procedure, then a C function is generated, along with any necessary directives for library inclusion.

  

- If x is a module, then the module members are translated as described on the CDetails help page.

• 

The parameter cgopts may include one or more CodeGeneration options, as described in CodeGenerationOptions.

• 

For more information about how the CodeGeneration package translates Maple code to other languages, see Translation Details. For more information about translation to C in particular, see CDetails.

Examples

For a description of the options used in the following examples, see CodeGenerationOptions.

withCodeGeneration:

Translate a simple expression and assign to the name ``w'' in the target code.

Cx+yz2xz,resultname=w

w = -2 * x * z + y * z + x;

Translate a list and assign to an array with name ``w'' in the target code.

Cx,2y,5,z,resultname=w

w[0][0] = x;
w[0][1] = 2 * y;
w[1][0] = 5;
w[1][1] = z;

Translate a computation sequence.  Optimize the input first.

cs:=s=1.0+x,t=lnsⅇx,r=ⅇx+xt:

Ccs,optimize

s = 0.10e1 + x;
t1 = log(s);
t2 = exp(-x);
t = t1 * t2;
r = x * t + t2;

Declare that x is a float and y is an integer. Return the result in a string.

s:=Cx+y+1,declare=x::float,y::integer,output=string

s:=cg = x + (double) y + 0.1e1;

(1)

Translate a procedure.  Assume that all untyped variables have type integer.

f := proc(x, y, z) return x*y-y*z+x*z; end proc:

Cf,defaulttype=integer

int f (int x, int y, int z)
{
  return(x * y - y * z + x * z);
}

Translate a procedure containing an implicit return.  A new variable is created to hold the return value.

f := proc(n)
  local x, i;
  x := 0.0;
  for i to n do
    x := x + i;
  end do;
end proc:

Cf

double f (int n)
{
  double x;
  int i;
  double cgret;
  x = 0.0e0;
  for (i = 1; i <= n; i++)
  {
    x = x + (double) i;
    cgret = x;
  }
  return(cgret);
}

Translate a procedure accepting an Array as a parameter.  Note that the indices are renumbered so that the C array starts at index 0.

f := proc(x::Array(numeric, 5..7))
  return x[5]+x[6]+x[7];
end proc:

Cf

double f (double x[3])
{
  return(x[0] + x[1] + x[2]);
}

Translate a module with one exported and one local procedure.

m := module() export p; local q;
    p := proc(x,y) if y>0 then trunc(x); else ceil(x); end if; end proc:
    q := proc(x) sin(x)^2; end proc:
end module:

Cm&comma;resultname&equals;t0

#include <math.h>

double q;
double p (double x, int y);

double q (double x)
{
  return(pow(sin(x), 0.2e1));
}

double p (double x, int y)
{
  if (0 < y)
    return((double) (int)(x));
  else
    return(ceil(x));
}

Translate an expression involving the max function.

Cmax1x&comma;x2

cg0 = (x * x >= 1 / abs(x) ? x * x : 1 / abs(x));

See Also

CDetails, CodeGeneration, CodeGenerationOptions, Translation Details


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