Comments on: Formatting numbers

By: Yair Altman

Yair Altman — Tue, 05 Apr 2016 15:49:00 +0000

In reply to Collin. @Collin -

sysClassLoader = java.lang.ClassLoader.getSystemClassLoader();
FieldClass = sysClassLoader.loadClass('java.text.NumberFormat$Field');
exponentField = FieldClass.getField('CURRENCY').get([]);

By: Collin

Collin — Tue, 05 Apr 2016 09:20:21 +0000

I need to format numbers with engineeering prefixes 1e3 to 1k, sometimes with units (1 kg).

Currently,I use DecimalFormat with the right prefix to get the exponent into groups of 3, than native matlab string handling and a hashtable to extract the correct prefic (exponent ‘3’ = ‘k’), all well and good. The FEX submission, num2sip (http://www.mathworks.com/matlabcentral/fileexchange/33174-number-to-scientific-prefix) does the same thing cleverer and all in native matlab.

My question is the use of a AttributedCharacterIterator and the attribute returned. The attribute returned is a java.text.NumberFormat.Field object but takes the form java.text.NumberFormat$Field(exponent field) and I can not seem to create a java.text.NumberFormat.Field object in matlab.

Any help would be appreciated

By: Yair Altman

Yair Altman — Tue, 12 Aug 2014 08:22:51 +0000

In reply to Ori. @Ori - you need to do it programmatically, there is no immediate solution for displaying a vector with different exponents.

By: Ori

Ori — Tue, 12 Aug 2014 07:30:43 +0000

Is there also a way to force a specific scientific notation power?

For example instead of Matlab displaying:

0.001e-3

Make it show 1.123e-6 ?

This is important sometimes when small numbers are part of a vector with larger values.

Thanks,

Ori

By: Grouping Digits | Now

Grouping Digits | Now — Mon, 20 Jan 2014 05:03:20 +0000

[…] I don’t have to face this issue in the context of international banking, like what he had (http://undocumentedmatlab.com/blog/formatting-numbers/). So I’m particularly grateful that the expert has written a *simple* article to illustrate […]

By: Donn Shull

Donn Shull — Mon, 29 Aug 2011 15:35:45 +0000

In reply to Mikhail. except for your next to last example you could use the sprintf option as follows:

 
for index = [0,2,4,5,7,8,10,11], disp(sprintf('%6.4g', 0.000012345678*10^index)); end
1.235e-005
0.001235
0.1235
1.235
123.5
1235
1.235e+005
1.235e+006

perhaps there are other solutions. Donn

By: Mikhail

Mikhail — Mon, 29 Aug 2011 09:04:48 +0000

Do you have a solution to format doubles leaving n (say 4) significant digits for pos/neg numbers between for example [1e-5, 1e+5] and scientific notation for very large/small numbers like in example below?

0.000012345678 -> 1.235e-005
0.001234567898 -> 0.001235
0.123456789876 -> 0.1235
1.234567898765 -> 1.235
123.4567898765 -> 123.5
1234.567898765 -> 1235
123456.7898765 -> 123457
1234567.898765 -> 1.234e+006