2021-09-28 19:23:06 +00:00
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# sign function
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def sgn(x):
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if x>=0:
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return 1
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return -1
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2021-09-29 03:36:07 +00:00
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# check whether a number is an integer (with tolerance)
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def isint_nonzero(x):
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if abs(x)<1e-11:
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return False
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return abs(round(x)-x)<1e-11
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2021-11-24 22:18:27 +00:00
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# check that a number is in an interval
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def in_interval(x,a,b):
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return x>=a and x<=b
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