Round outputs #7
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Adds a command line argument to specify whether to round the outputs
(and to how many decimal places).
```
-R ROUND_TO, --round-to ROUND_TO
number of digits to round outputs to
```
This addresses two rough edges with models that produce decimal
outputs. Firstly they may produce outputs with spurious or
uninteresting accuracy, secondly floating point arithmetic may produce
unhelpful decimal representations. Both are apparent in the example
below.
Without rounding:
```
$ cat pipeline.sys | systems-run | cut -f1,14- | expand --tabs=20
Options Initiatives Deliverables Observables Done
0 0 0 0 0 0
1 5 0 0 0 0
2 6 2 0 0 0
3 6 2 2 0 0
4 5.94 2.0 2.16 1.8 0
5 6.832000000000001 2.0 2.2880000000000003 1.8 1.8
6 6.6856 2.0 2.3904 1.8 3.6
7 6.5084800000000005 2.0 2.47232 1.8 5.4
8 6.306784 2.0 2.5378559999999997 1.8 7.2
9 6.0854272 2.0 2.5902847999999996 1.8 9.0
10 5.848341759999999 2.0 2.6322278399999997 1.8 10.8
```
With rounding:
```
$ cat pipeline.sys | systems-run --round-to 2 | cut -f1,14- | expand --tabs=14
Options Initiatives Deliverables Observables Done
0 0 0 0 0 0
1 5 0 0 0 0
2 6 2 0 0 0
3 6 2 2 0 0
4 5.94 2.0 2.16 1.8 0
5 6.83 2.0 2.29 1.8 1.8
6 6.69 2.0 2.39 1.8 3.6
7 6.51 2.0 2.47 1.8 5.4
8 6.31 2.0 2.54 1.8 7.2
9 6.09 2.0 2.59 1.8 9.0
10 5.85 2.0 2.63 1.8 10.8
```
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Hello. I'm not sure if you're maintaining this tool. I found it v useful, but I had to make a couple of small changes to make it do what I needed so I thought I'd see if you were interested in pull requests. (This is the first of two.)
It's unfortunate that the new arg name is so close to the existing one. Do let me know if you can think of better alternatives.