How to get Matlab to return answers with ten-digit accuracy?

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Noob
Noob 2020-9-17
评论： Noob 2020-9-18
Hi,
Answers returned by Matlab (e.g. from the ode45 solver, or from the wrapTo2Pi function that maps accumulating angles to [0, 2pi] ) seem to be within four digits of accuracy; that is, it rounds to four digits after the decimal place.
I'm currently studying convergence and root-finding and would like ten-digit accuracy -- so, a bit beyond the standard function tolerance of 1e-6 or 1e-7.
How can I get Matlab answers with ten-digit accuracy?
Thanks,

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回答（2 个）

Mario Malic
Mario Malic 2020-9-17
编辑：Mario Malic 2020-9-17
Write this on start of your script
format long
If you're reading the values from the workspace, find tab 'View' and under 'Format', click 'Long Fixed Decimal'.
Edit: this only changes displayed output, see James' answer.
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William
William 2020-9-17
The answers returned by Matlab actually have the full available precision, but for display purposes they are printed in the command window with a much smaller precision. You can change this default behavior by typing 'format long' or 'format longEng' in the command window.

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