Error in optim

[Emily]

I tried to run the following mirt code 

    mirt( minDat, 1, itemtype = 'gpcm', pars = sv, D = 1.7)

and I got an error message

Error: Error in optim(p, fn = Mstep.LL, gr = Mstep.grad, method = "BFGS", control = control,  : 

  non-finite value supplied by optim 

What shall I do? 

[Phil Chalmers]

You could try a more stable but slower optimizer, such as optimizer = 'nlminb'. Though I'm surprised this error occurred with the BFGS algorithm (in my experience it's quite stable; its cousin the L-BFGS-B, on the other hand, is sometimes a pain). Could you provide a reproducible example?

Phil

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[Yuanchao Emily Bo]

Thank you, Phil. 

i found the error in the code. Some of the slope parameters were set as NA so it caused the problem