added ecat test data set with negative values

[freec84]

I added a ecat7 file with negative values (transmission scan from ecat exac hr+ pet scanner) to the test data.
It seems that alls negative values are set to two times the maximum positive value when read in with nibabel ecat load.

[coveralls]

Coverage remained the same at 94.33% when pulling cced39e on freec84:add-pet-data-submodule into 96d474c on nipy:master.

[matthew-brett]

Great - thanks for this. Do you somewhere have the minimum value in image, as it should be (if we weren't messing up the negative numbers)? I'm thinking how to test we've got it right in due course.

[matthew-brett]

@freec84 - do you have any metrics from the correctly loaded data to help with tests? Like min, max, mean etc? If not - let me know anyway? Then I'll do my best to fix this without.

[freec84]

Hi Matthew,

the metrics are:

min: -0.00061576
max: 0.19215
mean: 0.04933
unit: 1/cm

Bests,
Georg

On 28/02/15 20:47, Matthew Brett wrote:

@freec84 https://github.com/freec84 - do you have any metrics from the
correctly loaded data to help with tests? Like min, max, mean etc? If
not - let me know anyway? Then I'll do my best to fix this without.

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Reply to this email directly or view it on GitHub
#297 (comment).

[matthew-brett]

Would you mind having a look at #302 - it should fix your problem, and gives the same answers as you give above.

[freec84]

Thanks a lot Matthew. You fix works. Negative values are now read in correctly.