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Matrix to 3 col sorted

 
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Old 09-21-2017
Matrix to 3 col sorted
Hello experts, I have matrices sorted by position, there are 400k rows, 3000 columns.

Code:
ID      CHR     POS     M1      M2      M3      M4      M5
ID1     1       1       4.6     2.6     2.1     3.5     4.2
ID2     1       100     3.6     2.9     3.2     2.6     2.5
ID3     1       1000    4.1     2.9     2.4     2.8     2.5
ID4     1       2000    4.2     2.4     2.8     3.7     2.8
ID5     1       3000    4.6     2.9     3.7     3.5     2.7
ID6     1       4000    5.2     3       3.2     4.2     3.7
ID7     1       5000    5.8     2.2     2.8     3.1     2.7

I`m looking for a sorted long-format output by position, grouped by markers (Ms)

Code:
M1 ID1__1__1 4.6
M1 ID2__1__100 3.6
M1 ID3__1__1000 4.1
M1 ID4__1__2000 4.2
M1 ID5__1__3000 4.6
M1 ID6__1__4000 5.2
M1 ID7__1__5000 5.8
M2 ID1__1__1 2.6
M2 ID2__1__100 2.9
M2 ID3__1__1000 2.9
M2 ID4__1__2000 2.4
M2 ID5__1__3000 2.9
M2 ID6__1__4000 3
M2 ID7__1__5000 2.2
M3 ID1__1__1 2.1
M3 ID2__1__100 3.2
M3 ID3__1__1000 2.4
M3 ID4__1__2000 2.8
M3 ID5__1__3000 3.7
M3 ID6__1__4000 3.2
M3 ID7__1__5000 2.8
M4 ID1__1__1 3.5
M4 ID2__1__100 2.6
M4 ID3__1__1000 2.8
M4 ID4__1__2000 3.7
M4 ID5__1__3000 3.5
M4 ID6__1__4000 4.2
M4 ID7__1__5000 3.1

I have two working methods

1. This step requires a final sorting which for 400000x3000 datapoints will be very row or run out of memory.


Code:
awk -F"\t" 'NR==1{split($0,lines);}NR>1{for(i=4;i<length(lines);i++) print lines[i],$1"__"$2"__"$3,$i}' tmp | sort -k1,1


2. This step is very very slow as it requires to take the entire matrix into memory before making splits.

Code:
awk -F"\t" '{a[NR]=$0}END{split(a[1],lines); for(i=4;i<=length(lines);i++) { for(j=2;j<=length(a);j++) { split(a[j],haps); print lines[i],haps[1]"__"haps[2]"__"haps[3],haps[i]}}}'  tmp


Is there a more efficient way to get the output I need? Thanks in advance.
 
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