On Monday 09 of December 2013 14:29:21 you wrote:
Great! So, applied the diff. Here some numbers:
PC1 238310.68 ( 0.1606, 0.2231, 0.1228, 0.9536) [96.10%]
PC2 9364.65 ( 0.4319, 0.5989, 0.6082,-0.2912) [ 3.78%]
PC3217.78 ( 0.7028, 0.1609,-0.6897,-0.0672) [ 0.09%]
PC4 80.33 (
On 07/12/13 17:46, Nikos Alexandris wrote:
Moritz Lennert wrote:
..
Try the attached diff to imagery/i.pca/main.c.
Great! So, applied the diff. Here some numbers:
PC1 238310.68 ( 0.1606, 0.2231, 0.1228, 0.9536) [96.10%]
PC2 9364.65 ( 0.4319, 0.5989, 0.6082,-0.2912) [ 3.78%]
PC3217.78 (
On Thu, Dec 5, 2013 at 1:15 PM, Nikos Alexandris
n...@nikosalexandris.net wrote:
Nikos Alexandris:
...we need those extra digits to make it easy rejecting last Principal
Component(s) prior to the backward PCA. Might be one, two or numerous (?)
depending on the dimensions.
Markus M:
I
On 04/12/13 23:46, Nikos Alexandris wrote:
Nikos Alexandris:
Here, immediate effect when percent=99.68. I guess it gets rounded to
99.7 ?
Moritz Lennert:
Actually, the man page says percent=integer. The input is treated with
atoi(). I don't know if that rounds or floors..
Heck, overlooked
On Wed, Dec 4, 2013 at 3:42 PM, Nikos Alexandris
n...@nikosalexandris.net wrote:
Nikos Alexandris wrote:
1) I can't see any differences in the derived Principal Components
..
okay, to clarify: I mean the resulting images which, initially are
Principal Components (synthetic images) and,
Nikos A:
Sorry for the noise. Then I need to see why the rescaling is not getting
at [0,255].
Markus M:
Rescaling applies to PC scores. With filtering, the output is not PC
scores, but a filtered version of the input. If you want the filtered
output to be rescaled, please use r.recode
Nikos Alexandris:
...we need those extra digits to make it easy rejecting last Principal
Component(s) prior to the backward PCA. Might be one, two or numerous (?)
depending on the dimensions.
Markus M:
I think it rather depends in the amount of information encoded in each PC.
It does. PCA
Hi list and Markus.
The i.pca module in G7 offers a forward/filtering/backward PCA. I have an
issue first with filtering and second with rescaling.
1) I can't see any differences in the derived Principal Components between
percent=70 and percent=99 for 4 bands which the PCs (both centered
On 04/12/13 14:53, Nikos Alexandris wrote:
Hi list and Markus.
The i.pca module in G7 offers a forward/filtering/backward PCA. I have an
issue first with filtering and second with rescaling.
1) I can't see any differences in the derived Principal Components between
percent=70 and percent=99
On Wednesday 04 of December 2013 16:22:51 Nikos Alexandris wrote:
Nikos Alexandris wrote:
The i.pca module in G7 offers a forward/filtering/backward PCA. I
have
an issue first with filtering and second with rescaling.
1) I can't see any differences in the derived Principal
On 04/12/13 15:22, Nikos Alexandris wrote:
Nikos Alexandris wrote:
The i.pca module in G7 offers a forward/filtering/backward PCA. I have
an issue first with filtering and second with rescaling.
1) I can't see any differences in the derived Principal Components
okay, to clarify: I mean
On 04/12/13 15:34, Nikos Alexandris wrote:
On Wednesday 04 of December 2013 16:22:51 Nikos Alexandris wrote:
Nikos Alexandris wrote:
The i.pca module in G7 offers a forward/filtering/backward PCA. I
have
an issue first with filtering and second with rescaling.
1) I can't see any differences
Moritz Lennert wrote:
Which components are used ? IIUC, in both cases it will be PCs 1 and 2 as
PC1 70% and PC1 + PC2 90%
Absolutely true (see previous post, I didn't cc you :(). Yet, consider the
following cases (just to justify why I started this thread):
1) Centered and Scaled with:
On 04/12/13 16:18, Nikos Alexandris wrote:
Here, immediate effect when percent=99.68. I guess it gets rounded to 99.7 ?
Actually, the man page says percent=integer. The input is treated with
atoi(). I don't know if that rounds or floors..
Moritz
Nikos Alexandris:
Here, immediate effect when percent=99.68. I guess it gets rounded to
99.7 ?
Moritz Lennert:
Actually, the man page says percent=integer. The input is treated with
atoi(). I don't know if that rounds or floors..
Heck, overlooked that :-(. In my very humble and
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