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# Improved

initial writing: 2000-11-29 last updated: 2000-11-29

The dyad # with a boolean left argument has been speeded up. The comparisons below are the times required to execute b#x for literal matrix x with 1 million rows and c columns, and b with different densities.

c	J 4.06	J 4.05

b=: ?1e6$2

1	0.028246	0.039711	1.41
2	0.036108	0.044163	1.22
3	0.069606	0.095045	1.37
4	0.046878	0.056785	1.21
5	0.083506	0.107324	1.29
6	0.087789	0.111811	1.27
7	0.097706	0.120133	1.23
8	0.069833	0.080781	1.16
9	0.110802	0.133968	1.21
10	0.114620	0.135994	1.19
11	0.123712	0.145668	1.18
12	0.121712	0.142609	1.17

b=: 0=?1e6$2

1	0.021645	0.028885	1.33
2	0.025371	0.032284	1.27
3	0.038318	0.045074	1.18
4	0.027887	0.035532	1.27
5	0.041930	0.048997	1.17
6	0.042752	0.049673	1.16
7	0.044320	0.051431	1.16
8	0.033570	0.042677	1.27
9	0.046767	0.054215	1.16
10	0.047497	0.054366	1.14
11	0.049510	0.056428	1.14
12	0.047460	0.054567	1.15

b=: 0<?1e6$2

1	0.025570	0.034124	1.33
2	0.033994	0.039973	1.18
3	0.065795	0.118823	1.81
4	0.052791	0.057959	1.10
5	0.086507	0.137851	1.59
6	0.091624	0.145361	1.59
7	0.104358	0.153416	1.47
8	0.086539	0.097586	1.13
9	0.129691	0.175373	1.35
10	0.133920	0.177648	1.33
11	0.146987	0.191267	1.30
12	0.154453	0.191511	1.24

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