Re: Optimal way to handle big data table ?

[Alexander Barth]

and of course you should write your code such that you read the data only once (e.g. passing the data as parameter or using global or persistent variables)

see "help global" and "help persistent".

On Wed, Mar 20, 2013 at 1:39 PM, Alexander Barth <address@hidden> wrote:

Hi Pascal,

You get the best input/output performance when using a binary file format (such as octave's mat format).

Cheers,

Alex

On Thu, Mar 7, 2013 at 11:07 AM, CdeMills <address@hidden> wrote:

Hello,

I was doing recently lamp spectrum analysis to extract photometric
properties. This implies to compute the integral of the spectrum by the
CIE1931 sensitivity functions; they are tabulated at 400 wavelength, each
time 4 values. What's the best way to use those data inside a function ?
1) encode them inside the function body ? It will be compiled once.
CIE31Table = [360 0.000130 0.000004 0.000606
              361 0.000146 0.000004 0.000681
              362 0.000164 0.000005 0.000765 ... ];
2) read them from a text file ?
3) read them from a binary file ?
4) other ?

The point is to minimise the computational load of each time refilling this
matrix with its 1600 entries.

Regards

Pascal



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