I am currently trying to get a numerical simulation running where one variable is iterated over many orders of magnitude. As the calculation takes pretty long, I would like to display a ProgressIndicator for the evaluation, preferreably for the logarithm of the above variable. Trying this, I encountered the following error:

The specified setting for the option FEFloatIterator cannot be used.

Playing around a bit, I found this minimal example that reproduces the error

  For[x = 1, x < 10, ++x, Pause[1]],
  ProgressIndicator[Log[x], {Log[1], Log[10]}]

The option FEFloatIterator seems to be undocumented, so I don't know what to do with this error message. The problem seems to originate from the logarithms, but further then that I have no idea.

  • 1
    $\begingroup$ This seems like a borderline bug to me. You might report it to WRI. $\endgroup$
    – Michael E2
    Nov 25, 2014 at 12:54
  • $\begingroup$ I just got the same error for a Slider where I had the range as {-Pi, Pi}. This was solved by writing N[{-Pi, Pi}]. Version 10.0.2 $\endgroup$
    – Hugh
    Jun 27, 2015 at 15:37

1 Answer 1


It seems ProgressIndicator can't interpret irrational numbers (I guess because they can be evaluated with any accuracy, while indicator needs some precise number). So just use floats explicitly:

  For[x = 1., x < 10, ++x, Pause[.1]], 
  ProgressIndicator[Log[x], {Log[1], Log[10.]}]]


  For[x = 1, x < 10, ++x, Pause[.1]], 
  ProgressIndicator[Log[N@x], {Log[1], Log[N@10]}]]
  • $\begingroup$ Thanks a lot, this perfectly fixed my problem. $\endgroup$ Dec 25, 2014 at 13:15

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