How do you use the solve function in a mat lab GUI?

A have made a GUI app in Matlab and I am trying to put in a solve function for two variables with two equatios but I am getting the error message that it does not recognize the function 'solve.'

Thi is my code for the button, that when clicked, calculates the time it takes:

system app.c

system app.t

Soln=solve(app.TargetH==-0.5*9.8*app.t^2+app.Velocity*sin(app.c)*app.t+app.RifleH, app.Distance==app.Velocity*cos(app.c)*app.t-(app.Coefficient*app.Air*app.Area*app.Velocity^2*app.t^2)/(2*app.Mass));

h=double(Soln.c);

g=double(Soln.t);

All preperties have been defined and I have tried putting the line

system c t

instead but then it wouldn't recognize the values c and t in the solve function.

If anyone knows how to make the solve funtion work or how to use a seperate method that would achieve the same goal I would apreicate any help.

Answer 1

[Steven Lord]

Are you attempting to define app.c and app.t as symbolic variables using these lines?

system app.c 
system app.t

That won't work; that calls the system function instead, and likely either throws an error (because there is no app command / executable for the operating system to run) or does something you probably don't expect.

Instead define symbolic variables and use them in your solve call:

c = sym('c');
t = sym('t');