# The IDL Way

- Is there a fast way to get the sum of the diagonals of an array?
- "My IDL program speed improved from 3 days to 32 seconds by removing loops!" A National Enquirer exclusive interview.
- Are
**FOR**loops the embodiment of pure evil? - Wow! Are
**FOR**loops*really*as bad as JD says they are? - How can I find the union, intersection, and difference between sets A and B?
- "Drizzling", "chunking" and other array
decimation tricks using
**Histogram**, naturally. - How can I do maximum value resampling of an image using a sampling box of arbitrary size?
- Small examples to illuminate the
*IDL Way*. - How do I construct a vector with values from one vector and a repeat count from another?
- Is there a fast way to find the intersection between a vector and an array?
- What is the “IDL Way” to average components of a time series?
- What is the best way to do odd-line smoothing of an array?
- How you show me the
*IDL Way*to turn an 8-bit color image into a 24-bit image? - Given XY pairs, how can I find the indices to perform an operation on the pairs using a Z data range?
- Can you show me the IDL Way to count specific values in small regions of an image?
- What is the IDL Way to remove arbitrary rows from a 2D array?

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Last Updated: 13 March 2011