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fortran

Fortran representation of symbolic expression

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Syntax

fortran(f)
fortran(f,Name,Value)

Description

fortran(f)returns Fortran code for the symbolic expressionf.

example

fortran(f,Name,Value)uses additional options specified by one or moreName,Valuepair arguments.

Examples

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Generate Fortran code from the symbolic expressionlog(1+x).

syms x f = log(1+x); fortran(f)
ans = ' t0 = log(x+1.0D0)'

Generate Fortran code for the 3-by-3 Hilbert matrix.

H = sym(hilb(3)); fortran(H)
ans = ' H(1,1) = 1.0D0 H(1,2) = 1.0D0/2.0D0 H(1,3) = 1.0D0/3.0D0 H(2,1) = 1.0D0/2.0D0 H(2,2) = 1.0D0/3.0D0 H(2,3) = 1.0D0/4.0D0 H(3,1) = 1.0D0/3.0D0 H(3,2) = 1.0D0/4.0D0 H(3,3) = 1.0D0/5.0D0'

Write generated Fortran code to a file by specifying theFileoption. When writing to a file,fortranoptimizes the code using intermediate variables namedt0,t1, .… Include comments in the file by using theCommentsoption.

syms x f = diff(tan(x)); fortran(f,'File','fortrantest')
t0 = tan(x)**2+1.0D0

Include the comment已经rsion: 1.1. Comment lines must be shorter than 71 characters to conform with Fortran 77.

fortran(f,'File','fortrantest','Comments','Version: 1.1')
*Version: 1.1 t0 = tan(x)**2+1.0D0

Input Arguments

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Symbolic input, specified as a symbolic expression.

Name-Value Arguments

Specify optional pairs of arguments asName1=Value1,...,NameN=ValueN, whereNameis the argument name andValueis the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and encloseNamein quotes.

Example:fortran(x^2,'File','fortrancode','Comments','V1.2')

File to write to, specified as a character vector or string. When writing to a file,fortranoptimizes the code using intermediate variables namedt0,t1, ....

Comments to include in the file header, specified as a character vector, cell array of character vectors, or string vector. Comment lines must be shorter than 71 characters to conform with Fortran 77.

Tips

  • MATLAB®is left-associative while Fortran is right-associative. If ambiguity exists in an expression, thefortranfunction must follow MATLAB to create an equivalent representation. For example,fortranrepresentsa^b^cin MATLAB as(a**b)**cin Fortran.

已经rsion History

Introduced before R2006a

See Also

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