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Scilab manual >> Elementary Functions > trisolve

# trisolve

symbolic linear system solver

### Calling Sequence

`[x [,sexp]] = trisolve(A,b [,sexp])`

### Arguments

A,b

matrices of strings

### Description

symbolically solves `A*x =b` , `A` being assumed to be upper triangular.

`sexp` is a vector of common subexpressions in `A, b, x`.

### Examples

```A=['x','y';'0','z'];b=['0';'1'];
w=trisolve(A,b)
x=5;y=2;z=4;
evstr(w)
inv(evstr(A))*evstr(b)```

F.D, S.S

### Comments

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