user defined variables in Match function

[Rays-Accelerator-Design]

Is it possible to use user defined variables in the match function. or

Ex:

    mad.match(sequence=SEQ_Name,
    constraints=[
    dict(range="FOCUSINGQUAD",
            myvar=Constraint(min=-0, max=0),
            alfy=bety,
            ),

Trying to define variable in madx file does not work and is not recognized.

[coldfix]

Hi,
I just realized I haven't answered on this so far.
As cpymad acts only as a proxy to input commands to MAD-X, it is limited by what type of constraints can be provided in the MAD-X language. In your example, the Madx.match() method would generate commands like this:

match, sequence="seq0";
constraint, myvar>0, myvar<0, alfy=bety;

However, MAD-X commands are defined using a fixed set of possible parameter names. So, no, I would say it is not possible in this form, you can only specify the compiled-in parameters, which you can look up e.g. like this:

>>> mad.command.constraint
constraint, weight=1.0, range=#s/#e, iindex=-1.0, pattern=any, betx=None, alfx=None, mux=None, bety=None, alfy=None, muy=None, x=None, px=None, y=None, py=None, t=None, pt=None, dx=None, dpx=None, dy=None, dpy=None, wx=None, phix=None, dmux=None, wy=None, phiy=None, dmuy=None, ddx=None, ddpx=None, ddy=None, ddpy=None, r11=None, r12=None, r21=None, r22=None, energy=None, mvar1=None, mvar2=None, mvar3=None, mvar4=None, re11=None, re12=None, re13=None, re14=None, re15=None, re16=None, re21=None, re22=None, re23=None, re24=None, re25=None, re26=None, re31=None, re32=None, re33=None, re34=None, re35=None, re36=None, re41=None, re42=None, re43=None, re44=None, re45=None, re46=None, re51=None, re52=None, re53=None, re54=None, re55=None, re56=None, re61=None, re62=None, re63=None, re64=None, re65=None, re66=None, sig11=None, sig12=None, sig13=None, sig14=None, sig15=None, sig16=None, sig21=None, sig22=None, sig23=None, sig24=None, sig25=None, sig26=None, sig31=None, sig32=None, sig33=None, sig34=None, sig35=None, sig36=None, sig41=None, sig42=None, sig43=None, sig44=None, sig45=None, sig46=None, sig51=None, sig52=None, sig53=None, sig54=None, sig55=None, sig56=None, sig61=None, sig62=None, sig63=None, sig64=None, sig65=None, sig66=None, alfa=None, beta11=None, alfa11=None, mu1=None, beta22=None, alfa22=None, mu2=None, beta33=None, alfa33=None, mu3=None, disp1=None, disp2=None, disp3=None, disp4=None;

I personally haven't used MAD-X in a while, so it would be better to ask a MAD-X user who is more update-to-date and knowledgeable if they know a better way to achieve your goal.

Best,
Thomas