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How to create multidimensional array

...ar numeric = [ ['input1','input2'], ['input3','input4'] ]; numeric[0][0] == 'input1'; numeric[0][1] == 'input2'; numeric[1][0] == 'input3'; numeric[1][1] == 'input4'; var obj = { 'row1' : { 'key1' : 'input1', 'key2' : 'input2' }, 'row2' : { 'key3' : 'inpu...
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Obfuscated C Code Contest 2006. Please explain sykes2.c

...>> ";;;====~$::199"[_*2&8|_/64]/(_&2?1:8)%8&1 : 10); } Introducing variables to untangle this mess: main(int i) { if(i^448) main(-~i); if(--i % 64) { char a = -~7[__TIME__-i/8%8][">'txiZ^(~z?"-48]; char b = a >> ";;;====~$::199"[i...
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Split (explode) pandas dataframe string entry to separate rows

... for _, row in a.iterrows()]).reset_index() Out[55]: index 0 0 a 1 1 b 1 2 c 1 3 d 2 4 e 2 5 f 2 Then you just have to rename the columns share | impr...
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How can I add a box-shadow on one side of an element?

...the box-shadow rule: .myDiv { border: 1px solid #333; width: 100px; height: 100px; box-shadow: 10px 0 5px -2px #888; } <div class="myDiv"></div> The fourth property there -2px is the shadow spread, you can use it to change the spread of the shadow, making it a...
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Converting strings to floats in a DataFrame

...) or pd.to_numeric as described in other answers. This is available in 0.11. Forces conversion (or set's to nan) This will work even when astype will fail; its also series by series so it won't convert say a complete string column In [10]: df = DataFrame(dict(A = Series(['1.0','1']), B = Series...
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How to create the most compact mapping n → isprime(n) up to a limit N?

...ent every odd number with one bit e.g. for the given range of numbers (1, 10], starts at 3: 1110 31 Answers ...
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Moving decimal places over in a double

... 190 If you use double or float, you should use rounding or expect to see some rounding errors. If yo...
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Detect if value is number in MySQL

... answered Feb 21 '11 at 10:47 RichardTheKiwiRichardTheKiwi 96.3k2323 gold badges178178 silver badges250250 bronze badges ...
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What does axis in pandas mean?

... It specifies the axis along which the means are computed. By default axis=0. This is consistent with the numpy.mean usage when axis is specified explicitly (in numpy.mean, axis==None by default, which computes the mean value over the flattened array) , in which axis=0 along the rows (namely, index ...
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App Inventor 2 数学代码块 · App Inventor 2 中文网

...代码块 基础数字块 ( 0 ) 进制数字块 ( 0 ) 等于 ( = ) 不等于 ( ≠ ) 大于 ( > ) 大于等于 ( ≥ ) 小于 ( < ) 小于等于 ( ≤ ) 加 ( + ) 减 ( - ) 乘 ( * ) 除 ( / ) 幂运算 ( ^ ) 随机整数 (rando...