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From: Johnson on 8 Jun 2010 20:03
I think by default MATLAB can support maximum 15 significant digits
(Version 7.2.6). However, I need more digits for scientific computation.
So what is the best (or easiest) way to increase the significant digits
of a number at MATLAB?

I tried digits function in the command window, and I got the following
error:
>> digits(18)
??? Undefined function or method 'digits' for input arguments of type
'double'.

Thank you.

John

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From: Steven Lord on 8 Jun 2010 22:13

"Johnson" <gpsabove(a)yahoo.com> wrote in message
news:humlo0$2pmi$1(a)adenine.netfront.net...
>I think by default MATLAB can support maximum 15 significant digits
>(Version 7.2.6).

The default data type in MATLAB is IEEE double-precision floating point.

> However, I need more digits for scientific computation. So what is the
> best (or easiest) way to increase the significant digits of a number at
> MATLAB?

Use Symbolic Math Toolbox.

> I tried digits function in the command window, and I got the following
> error:
> >> digits(18)
> ??? Undefined function or method 'digits' for input arguments of type
> 'double'.

That would indicate you don't have Symbolic Math Toolbox installed or don't
have a license for this toolbox available.

--
Steve Lord
slord(a)mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
To contact Technical Support use the Contact Us link on
http://www.mathworks.com


From: Walter Roberson on 9 Jun 2010 01:10
Steven Lord wrote:
> "Johnson" <gpsabove(a)yahoo.com> wrote in message
> news:humlo0$2pmi$1(a)adenine.netfront.net...
>> I think by default MATLAB can support maximum 15 significant digits
>> (Version 7.2.6).
>
> The default data type in MATLAB is IEEE double-precision floating point.
>
>> However, I need more digits for scientific computation. So what is the
>> best (or easiest) way to increase the significant digits of a number at
>> MATLAB?
>
> Use Symbolic Math Toolbox.

Right. Or the indefinite precision toolkit that is in the Matlab File
Exchange.
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