### pdbnormalize - normalize a bunch of columns

`pdbnormalize` takes an input file and takes each column value from a
number of columns and divides it by the maximum value seen in all the
columns.

*Note: this is the maximum value of all columns provided; if
you want per-column normalization, run the tool multiple times
instead.*

*Note: this requires reading the entire file into memory.*

#### Example input (*myfile.fsdb*):

```
#fsdb -F s col1:l two:a andthree:d
1	key1	42.0
2	key2	123.0
3	key1    90.2
```

#### Example command usage

```
$ pdbnormalize -k andthree -- myfile.fsdb
```

#### Example output

```
pdbnormalize -k andthree -- myfile.fsdb
#fsdb -F t col1:l two andthree:d
1	key1	0.34146341463414637
2	key2	1.0
3	key1	0.7333333333333334
```

#### Example normalizing 2 columns:

If you normalize multiple columns, be aware that the divisor is the
maximum of all the values from all the columns.  Thus by passing both
columns `col1` and `andthree`, you'll note in the output below that
even col1 is divided by the maximum value from both columns in the
input (*123.0*).

```
$ pdbnormalize -k col1 andthree -- myfile.fsdb
```

#### Example output

```
0.008130081300813009	key1	0.34146341463414637
0.016260162601626018	key2	1.0
0.024390243902439025	key1	0.7333333333333334
```