ReadFcn error from nhdr_nrrd_read

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Sophia Sklar
Sophia Sklar on 6 Nov 2020
Answered: Raunak Gupta on 13 Nov 2020
I am building a trainnetwork script and trying to build 2 databases: one uses mha_read_volume and the other uses nhdr_nrrd_read. The error message is coming from the nrrd reader stating: The output of the custom ReadFcn must be a categorical matrix
I think it has something to do with the 'data' field not being read in properly, but I'm not sure how to fix it.
I attached the trainnetwork script along with a screenshot of the error message. If anyone has any ideas how to fix this please send help!!

Answers (1)

Raunak Gupta
Raunak Gupta on 13 Nov 2020
As the error message suggest the custom ReadFcn must return a categorical array for pixel labels. If the file you are reading return a numeric array you can convert it to categorical array using categorical.
This example tells how the pixel label data may look like.


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