Home > freetb4matlab > symbolic > symfsolve.m

# symfsolve

## PURPOSE

% Solve a set of symbolic equations using fsolve. There are a number of

## SYNOPSIS

function [ x,inf,msg ] = symfsolve (varargin)

## DESCRIPTION

```% -*- texinfo -*-
% @deftypefn {Function File} {[ @var{x},@var{inf},@var{msg} ] =} symfsolve (...)
% Solve a set of symbolic equations using fsolve. There are a number of
% ways in which this function can be called.
%
% This solves for all free variables, initial values set to 0:
%
% @example
% symbols
% x=sym('x');   y=sym('y');
% f=x^2+3*x-1;  g=x*y-y^2+3;
% a = symfsolve(f,g);
% @end example
%
% This solves for x and y and sets the initial values to 1 and 5 respectively:
%
% @example
% a = symfsolve(f,g,x,1,y,5);
% a = symfsolve(f,g,@{x==1,y==5@});
% a = symfsolve(f,g,[1 5]);
% @end example
%
% In all the previous examples vector a holds the results: x=a(1), y=a(2).
% If initial conditions are specified with variables, the latter determine
% output order:
%
% @example
% a = symfsolve(f,g,@{y==1,x==2@});  % here y=a(1), x=a(2)
% @end example
%
% The system of equations to solve for can be given as separate arguments or
% as a single list/cell-array:
%
% @example
% a = symfsolve(@{f,g@},@{y==1,x==2@});  % here y=a(1), x=a(2)
% @end example
%
% If the variables are not specified explicitly with the initial conditions,
% they are placed in alphabetic order. The system of equations can be comma-
% separated or given in a list or cell-array. The return-values are those of
% fsolve; @var{x} holds the found roots.
% @end deftypefn
% @seealso{fsolve}```

## CROSS-REFERENCE INFORMATION

This function calls:
This function is called by:

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