exp(A) gives zero in the first argument

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Antonios Nasioulas
Antonios Nasioulas 2019-10-19
评论： Star Strider 2019-10-19
When I compute for example
exp([71 307])
on matlab (on my laptop version) I get
ans =
1.0e+133 *
0.0000 2.1301
Which seems pretty unreasonable to me as 71 is not that big and of course not bigger than 307.
Also if I put the same computation on octave online I get
ans =
6.8377e+30 2.1301e+133
which makes tottaly sense.
Do you know what is going wrong?

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Star Strider
Star Strider 2019-10-19
Try this:
format longE
exp([71 307])
producing:
ans =
6.837671229762744e+30 2.130129192828224e+133
See the documentation on format for more information.
  2 个评论
Antonios Nasioulas
Antonios Nasioulas 2019-10-19
Yes, this works.
But is there a bug on my version or what happens and I get this odd result?
Star Strider
Star Strider 2019-10-19
There is no bug. The default format is short. You can change it in the Preferences to something else, or change it specifically for one calculation or a set of calculations as I did here, then (if you want to), change it back to a previous definition. The chosen format will be whatever you chose for it when you start MATLAB, and if you change it, the change will remain until you change it to something else. See the documentation I linked to for details.

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