How can I format a float so that it doesn’t contain trailing zeros? In other words, I want the resulting string to be as short as possible. For example: 3 -> “3” 3. -> “3” 3.0 -> “3” 3.1 -> “3.1” 3.14 -> “3.14” 3.140 -> “3.14” 20 Answers 20
How can one modify the format for the output from a groupby operation in pandas that produces scientific notation for very large numbers? I know how to do string formatting in python but I’m at a loss when it comes to applying it here. df1.groupby(‘dept’)[‘data1’].sum() dept value1 1.192433e+08 value2 1.293066e+08 value3 1.077142e+08 This suppresses the … Read more
Why do some numbers lose accuracy when stored as floating point numbers? For example, the decimal number 9.2 can be expressed exactly as a ratio of two decimal integers (92/10), both of which can be expressed exactly in binary (0b1011100/0b1010). However, the same ratio stored as a floating point number is never exactly equal to … Read more
The hash of infinity in Python has digits matching pi: >>> inf = float(‘inf’) >>> hash(inf) 314159 >>> int(math.pi*1e5) 314159 Is that just a coincidence or is it intentional? 3 Answers 3
The float data type is a single-precision 32-bit IEEE 754 floating point and the double data type is a double-precision 64-bit IEEE 754 floating point. What does it mean? And when should I use float instead of double or vice-versa? 9 Answers 9
How can I round a float value (such as 37.777779) to two decimal places (37.78) in C? 17 Answers 17
I need a simple floating point rounding function, thus: double round(double); round(0.1) = 0 round(-0.1) = 0 round(-0.9) = -1 I can find ceil() and floor() in the math.h – but not round(). Is it present in the standard C++ library under another name, or is it missing?? 23 Answers 23
Here is the example with comments: class Program { // first version of structure public struct D1 { public double d; public int f; } // during some changes in code then we got D2 from D1 // Field f type became double while it was int before public struct D2 { public double d; … Read more
I am currently building a sales module for a clients website. So far I have got the sale price to calculate perfectly but where I have come stuck is formatting the output to 2 decimal places. I am currently calling this in a variable so that I can data bind the results to a listview. … Read more
I am trying to find the largest cube root that is a whole number, that is less than 12,000. processing = True n = 12000 while processing: n -= 1 if n ** (1/3) == #checks to see if this has decimals or not I am not sure how to check if it is a … Read more
