solve function

[hassanb...@gmail.com]

I wrote a program (witch is available in the attachment) to calculate a variable( 'w' in the program) by calculating determinate of a matrix (witch include the variable) equal to zero. but I don't know why it doesn't work for l=0.01 and work for l=0.0.
I use version 7.4.1 of Sympy.
    

[Chris Smith]

Don't use solve if you just want a numerical value for this quintic determinant, use nsolve:

>>> nsolve(determ, w, 0)

mpf('0.51659678129991493')