writeexpr

Save optimization expression description

Syntax

writeexpr(expr)

writeexpr(expr,filename)

Description

writeexpr(expr) saves a description of the optimization expression expr in a file named expr.txt. Here, expr is the workspace variable name of the expression. If writeexpr cannot construct the file name from the expression, it writes the description to WriteExprOutput.txt instead. writeexpr overwrites any existing file.

writeexpr(expr,filename) saves a description of the optimization expression expr in a file named filename.

Examples

Save Expression Description

Create an optimization variable and an expression that uses the variable. Save a description of the expression to a file.

x = optimvar('x',3,3);
A = magic(3);
var = sum(sum(A.*x));
writeexpr(var,"VarExpression.txt")

The VarExpression.txt file contains the following text:

  8*x(1, 1) + 3*x(2, 1) + 4*x(3, 1) + x(1, 2) + 5*x(2, 2) + 9*x(3, 2) + 6*x(1, 3) + 7*x(2, 3)
+ 2*x(3, 3)

Input Arguments

expr — Optimization expression

OptimizationExpression object

Optimization expression, specified as an OptimizationExpression object.

Example: sum(sum(x))

filename — Path to file

string | character vector

Path to the file, specified as a string or character vector. The path is relative to the current folder. The resulting file is a text file, so the file name typically has the extension .txt.

Example: "../Notes/steel_stuff.txt"

Data Types: char | string

Tips

• To obtain the writeexpr information at the MATLAB^® Command Window, use showexpr.

Compatibility Considerations

is not recommended

Not recommended starting in R2019b

The writeexpr function is not recommended. Instead, use write. The write function replaces writeexpr and many other problem-based functions.

There are no plans to remove writeexpr at this time.