Newbie Programming Mistakes: Difference between revisions
Created page with "==Weird Syntax== ===comparison to true or false=== If you have a bool, you can just use it instead of comparing to <code>true</code> or <code>false</code>: <syntaxhighlight lang="python"> # some code which produces a bool b b = a > 5 # return b == false return not b </syntaxhighlight> Similarly, you don't need to do: <syntaxhighlight lang="python"> # Unnecessary if not b: return true else: return false </syntaxhighlight> ==Not using vectorization== If you're using..." |
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If you have a bool, you can just use it instead of comparing to <code>true</code> or <code>false</code>: | If you have a bool, you can just use it instead of comparing to <code>true</code> or <code>false</code>: | ||
<syntaxhighlight lang="python"> | <syntaxhighlight lang="python"> | ||
# some code which produces | # some code which produces bool b | ||
b = a > 5 | b = a > 5 | ||
# return b == false | # return b == false | ||
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==Not using vectorization== | ==Not using vectorization== | ||
If you're using a language like Python or R, you can take advantage of faster SIMD instructions by using vectorized code. | If you're using a language like Python or R, you can take advantage of faster SIMD instructions by using vectorized code.<br> | ||
Instead of writing: | Instead of writing: | ||
<syntaxhighlight lang="python"> | <syntaxhighlight lang="python"> | ||
a = np.arange(5) | a = np.arange(5) | ||
b = np.arange(5) | b = np.arange(5) | ||
# Bad | |||
c = np.zeros(5) | c = np.zeros(5) | ||
for i in range(len(a)): | for i in range(len(a)): | ||
c[i] = a[i] + 5*b[i] | c[i] = a[i] + 5*b[i] | ||