I am fairly new to Perl and haven't approached a scipt
this complex or computation this intensive. So I
would certainly appreciate any advice.
I have successfully created a hash of arrays
equivalent to a 122 x 6152 matrix that I want to run
in 'pairwise combinations' and execute the 'sum of the
difference squares' for each combination.
In other words:
rows: y1...y122
columns: x1...x6152
so...
comb(y1,y2):
{( y1[x1] - y2[x1] ) ^2 + ( y1[x2] - y2[x2] ) ^2 + ...
+ ( y1[x122] - y2[x122] ) ^2};
comb(y1,y3):
{( y1[x1] - y3[x1] ) ^2 + ( y1[x2] - y3[x2] ) ^2 + ...
+ ( y1[x122] - y3[x122] ) ^2};.
.
.
comb(y1,y6152)
comb(y2,y3)
.
.
comb(y2,y6152)
comb(y3,y4)
.
.
etc.
This is going to be very large. According to the
combinations formula (nCk, n=6152, k=2), the output
will be a hash (with, for example, 'y1y2' key and
'd^2' value) of about 19 million records.
I think my next step is to create a combinations
formula, but I'm having problems doing so.
Thank you in advance,
David
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