Constraints with fsolve

How would you all recommend setting constraints while using fsolve? I am trying to use it to solve a multi-variable equation, similar to using Solver in Excel (setting one cell equal to zero by changing several other cells). Could I use conditional statements?

Please note that I am not an experienced matlab user or programmer. (I've just finished my sophomore year in Engineering school.)

[John Smith]

I meant, setting constraints on the possible values of the variables.

Answer 1

[John D'Errico]

Fsolve CANNOT have constraints. The use of conditional statements inside your objective would often cause fsolve to fail to properly converge.

[Jun W]

What about reducing the decimal places or reduce resolution (whatever you call it)? Say I have the output x(1)= 1.0000005823241514, x(2) = -4.511476108384046e-15. I just want x(1) to be 1, x(2) to be 0, how do I do that?

[Walter Roberson]

passing in initial values of type single() might help.