[GRASS-user] i.PCA r.info output format

[Hamish]

Rebecca wrote:
> I have undertaken a  number of transformations of spectral
> data using the i.pca in both GRASS 6.4 and GRASS 7.
> Unfortunately when more than 6 bands are used r.info cannot
> display the eigen vectors and % importance
> Output for r.info should look like this:
>
>   PC1   1170.12 ( -0.63 -0.65 -0.43 ) [ 88.07% ]
>   PC2    152.49 (  0.23  0.37 -0.90 ) [ 11.48% ]
>
> But instead looks like this:
>
> PC1 13770134.87 ( 0.1019, 0.5087, 0.1896, 0.5185, 0.4578, 0.4527, 0.107
> 6PC2 174134.96 ( 0.6530,-0.1228,-0.0673,-0.1493,-0.0026, 0.0203, 0.7289
>
> with the full metadata being truncated.
>
> As I know the values are being calculated as they display
> in the i.pca output upon completion, so this appears to be a
> size issue with the display of r.info?

GRASS 6's metadata system has a historical wart which limits
the history file's column width to 80 characters and 40 lines.

> Is there any way to access the full metadata for the rasters
> without recalculating them?

If you're lucky, the data will be in the $MAPSET/hist/$MAPNAME
file and r.info is just failing to pass it on.

If it's not, please let us know/file a bug report.


Hamish