If doing so prints anything besides 0, then floating point errors occurred before the block. To check if your program is generating the floating point error before this block, place print, check_math() at the top of the code block.
That's because IDL doesn't actually report floating point errors until either a function returns, the program ends/crashes, or the check_math() function is called. printed before the floating point illegal operand error. % Program caused arithmetic error: Floating illegal operand As unintuitive as this is, consider the following block of code: x = sqrt(-1.0) All the same, it's another thing to try which debugging.įinally, it's possible that the Floating illegal operand error is actually being caused before the READF: End of file encountered error. In this particular case, it's unlikely to matter, since eof should return either 1B or 0B, the bit-wise inverse of which are identical to the logical inverse. Thus instead of not(eof(1)) or not eof(1), consider using ~eof(1). The more appropriate operator here would be "logical not", ~. In IDL, not is the bit-wise not, meaning it inverts all the bits of the next term. Unit: 1, File: results.Īnother possible issue is the use of not(eof(1)), which is non-standard. In this case, because you are reading into a byte array instead of a float array, the only error should be READF: End of file encountered.
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To investigate, you might like to try substituting the following code: close, 1 & openr, 1, filename, error=err GyazMail is described as 'email client software for Mac OS X, based on Cocoa framework, simple, easy-to-use with many features' and is a Email Client in the office & productivity category. When that happens, IDL will attempt to make an informed guess as to which float number yourĭata should have been, but doing so is not technically part of the IEEE standard, so it raises the Program caused arithmetic error: Floating illegal operand error. If you inadvertently encounter the end of theįile, there's a high chance that some of the data read from the file won't fit nicely into a float32. Not all 32-bit series of 1s and 0s make a valid IEEE float32 (the "float" values used in IDL and most other languages). IDL is expecting to read in 41 32-bit float values, but some or all of the values it reads in are not
The illegal floating point operation is probably not from not(eof(1)) but from readf, 1, line or carried over from another portion of the code.
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