how to confine the solutions when solving a system of equations

Question

studentU 2015-5-18

编辑： studentU 2015-5-18

hi,

how can I set the interval of definition of variables, solves using the function solve ()?

interval solution: x0<x<x1, y0<y<y1, z0<z<z1, equations to resolve: f(x,y)=0,f(x,z)=0 and f(y,z)=0

Answer 1

Walter Roberson 2015-5-18

In the solve() documentation read down to "Solving Inequalities". You can, for example,

syms x y
f = .... some formula
solve(f, x0 < x, x < x1, y0 < y, y < y1)

studentU 2015-5-18

编辑：studentU 2015-5-18

>> i try to run: >> syms x y G F X1 X2 el

[a,b] = solve('G*cos(y)+F*sin(y)=1',' cos(y)*sin(el)-sin(y)*X2*cos(x)-sin(y)*X3*sin(x)=1','-90<y','y<90','-180<x','x<180');

but it's generate this error:

z = C_ z13 = C_ z23 = C_ z33 = C_

> In solve at 94 ??? Error using ==> solve>assignOutputs at 153 6 variables does not match 2 outputs.

Error in ==> solve at 97 varargout = assignOutputs(nargout,sol);