Generate C formatted string
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generate::C(e
, <NoWarning>)
generate::C(e)
generates C code for the MuPAD^{®} expression e
.
generate::C
returns a C formatted string
representing an expression, equation, list of equations or a matrix.
An equation represents an assignment in C code. The type of
the assignment is double
.
When generating C code for a matrix, the generator assigns only nonzero elements. See Example 3.
To print an output string to a file, use the fprint
function. Use
the printing option Unquoted
to remove quotation
marks and to expand special characters like line breaks and tabs.
Use the generate::optimize
function to optimize
the MuPAD code before converting it to C code. See Example 5.
The NoWarning
option lets you suppress warnings.
See Example 6.
The code generator converts a list of equations to a sequence of assignments:
generate::C([x1 = y2^2*(y1 + sin(z)), x2 = tan(x1^4)]): print(Unquoted, %)
x1 = (y2*y2)*(y1+sin(z)); x2 = tan(x1*x1*x1*x1);
MuPAD matrix and array indexing differs from C array indexing.
By default, MuPAD array indices start with 1, and C array indices
start with 0. To create the code compatible with the default indexing
in C, the generate::C
function decrements each
index by one:
A:= matrix([[1,2],[3,4]]): generate::C(A)."\n". generate::C(hold(Determinante = A[1,1]*A[2,2]  A[1,2]*A[2,1])): print(Unquoted, %)
A[0][0] = 1.0; A[0][1] = 2.0; A[1][0] = 3.0; A[1][1] = 4.0; Determinante = A[0][0]*A[1][1]A[0][1]*A[1][0];
Generated C code does not include assignments for zero elements of a matrix:
A:= matrix([[1, 0, 0],[0, 0, 1]]): print(Unquoted, generate::C(A))
A[0][0] = 1.0; A[1][2] = 1.0;
If the first index of an array is not 1, the generate::C
function
issues a warning:
A:= array(1..2, 2..3, [[1,2],[3,4]]): print(Unquoted, generate::C(A))
Warning: Array index 'A[1..2, 2..3]' out of range 1..n. [DOM_ARRAY::CF]
A[0][1] = 1.0; A[0][2] = 2.0; A[1][1] = 3.0; A[1][2] = 4.0;
The generate::C
function does not optimize
your code:
print(Unquoted, generate::C([x = a + b, y = (a + b)^2])):
x = a+b; y = pow(a+b,2.0);
You can use the generate::optimize
function before converting
your MuPAD expression to C code. For example, this function can reduce
the number of operations by finding common subexpressions:
print(Unquoted, generate::C( generate::optimize([x = a + b, y = (a + b)^2]) )):
x = a+b; y = x*x;
By default, the generate::C
function can
issue warnings:
print(Unquoted, generate::C(f(x)))
Warning: Function 'f' not verified to be a valid C function.
t0 = f(x);
If you started using generate::C
recently,
the warnings can help you identify the potential issues in the converted
code. If you want to suppress warnings, use the NoWarning
option:
print(Unquoted, generate::C(f(x), NoWarning))
t0 = f(x);

An expression, equation, list of equations, or a matrix 

Suppress warnings. 
generate::C
returns a string containing
C code.