Consider the following simple loop:


Mathematica writes:





I want mathematica to write dynamically the value of the variable n. I mean I want Mathematica to write 1, cancel it and write 2, cancel it and write 3 and so on.

Is it possible?

  • 1
    $\begingroup$ Try n=0;Dynamic[n] and then (in a new line) Do[n++;,{100000000}]. $\endgroup$ – Henrik Schumacher Aug 31 '18 at 15:42

You can use Monitor

Monitor[Do[n++; Pause[.5], {10}], n]

Monitor can increase the time of a calculation. Use Refresh to control the update interval used for displaying:

 Monitor[Do[i, {i, 10^7}],
 Refresh[Pause[0.03] i, UpdateInterval -> 0.2, TrackedSymbols -> {}]]

Or as Henrik said in the comment Dynamic:

Do[n++; Pause[.5], {10}]

But Dynamic is purely frontend function. Monitor is convinient for computation, for example for long running remote monitoring:

Monitor[Do[n++;, {3}], 
 SendMail["test@test.com", "n = " <> ToString[n]]]

BTW take a look at Echo too, might come handy, while not this case.

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