if statement in CasADi function

[Marco Vaccari]

Hi everybody,

I have a python function fun_py(x, y, z) built in a way similar to this

def fun_py(x,y,z):

    value1 = 1.0

    value2 = 2.0 

    if x[0] > value2:

       out = x+y+z

    elif x[0] > value1:

      out = y+z

    else: 

      out = z

    

    return out

I want now to build a Function

fun_cs = Function('fun_cs', [x,y,z], [fun_py]).

 When I run this command, I have this error: TypeError - cannot compute truth value of casadi ex-elem symbolic expression. 

Do you know if there is a way to compute this?

Best regards,

Marco 

[Joel Andersson]

Hi!

Try the following:

out = if_else(x[0] > value2, x+y+z, if_else(x[0] > value1, y+z, z))

Joel

[Marco Vaccari]

Hi Joel,

I'll try and then I'll let you know. Thanks for now.

[Marco Vaccari]

Hi Joel, 

thanks for your help, it works but I have a further request for you. If the python function is:

def fun_py(x,y,z):

    value1 = 1.0

    value2 = 2.0

    value3 = 3.0

    if x[0] > value2 and x[0] < value3 :

       out = x+y+z

    elif x[0] > value1:

      out = y+z

    else: 

      out = z

how can I translate the AND statement?

Best,

Marco

Il giorno venerdì 15 luglio 2016 17:08:00 UTC+2, Joel Andersson ha scritto:

[Joel Andersson]

casadi.logic_and

[Marco Vaccari]

Thanks for your reply. 

Il giorno mercoledì 20 luglio 2016 04:24:51 UTC+2, Joel Andersson ha scritto:

casadi.logic_and