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Scilab help >> Strings > evstr

# evstr

evaluation of expressions

### Calling Sequence

```H=evstr(Z)
[H,ierr]=evstr(Z)```

### Arguments

Z

matrix of character strings `M` or `list(M,Subexp)`

M

matrix of character strings

Subexp

vector of character strings

H

matrix

ierr

integer, error indicator

### Description

Returns the result of the evaluation of the matrix of character strings `M`. Each element of the matrix must define a valid Scilab expression.

If the evaluation of `M` expression leads to an error, the single return value version, `H = evstr(M)`, raises the error as usual. The two return values version, `[H,ierr] = evstr(M)`, on the other hand, produces no error, but returns the error number in `ierr`.

If `Z` is a list, `Subexp` is a vector of character strings, that defines sub_expressions which are evaluated before evaluating `M`. These sub_expressions must be referred to as `%(k)` in `M`, where `k` is the sub-expression's index in `Subexp`.

evstr('a = 1') is not valid (use `execstr` instead).

Nan, NaN will be interpreted as %nan.

Inf will be interpreted as %inf.

### Examples

```a = 1; b = 2; Z = ['a', 'b'] ; evstr(Z)
a = 1; b = 2; Z = list(['%(1)','%(1)-%(2)'],['a+1','b+1']);
evstr(Z)

evstr('NaN'), evstr('Inf')```

### See Also

• execstr — execute Scilab code in strings
• evstr — evaluation of expressions
• execstr — execute Scilab code in strings
 << eval Strings grep >>

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