Reading in values from file
I'm trying to implement an image processing system in Xilinx and right now I'm stuck on reading in the values. I'm using PGM image format because it stores the pixel values in ascii format so it's easy to to read them in. However the first 4 lines I need to read in and disregard (don't need the data) but I keep getting an error. Below is the segment of code I'm referring to. It gives me an error on the bolded part.
I tried changing the row'length expression to row /= null and I just get the same error but with 'DerefOp' replaced with 'NullValue'
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