Float storage precision in hardware only to 13 decimals Question: There are many similar questions related to floating point, and I have read all of them that came up. Still, I am not able to grasp what I am doing wrong. Python3 Cython reference interpreter on 64-bit x86 machine stores floats as double precision, 8 …
How to prevent Floating-Point errors with Pandas Question: I have a problem with my Python code. I’m using pandas to read a Dataset and store it in a Data Frame. I’m now trying to convert ug to mg (1000ug == 1 mg) and g to mg (1000 mg == 1g). I’m first converting the Datatype of the …
Why does timestamp() show an extra microsecond compared with subtracting 1970-01-01? Question: The following differ by 1 microsecond : In [37]: datetime(2514, 5, 30, 1, 53, 4, 986754, tzinfo=dt.timezone.utc) – datetime(1970,1,1, tzinfo=dt.timezone.utc) Out[37]: datetime.timedelta(days=198841, seconds=6784, microseconds=986754) In [38]: datetime(2514, 5, 30, 1, 53, 4, 986754, tzinfo=dt.timezone.utc).timestamp() Out[38]: 17179869184.986755 The number of microseconds in 986754 in …
Why does math.cos(math.pi/2) not return zero? Question: I came across some weird behavior by math.cos() (Python 3.11.0): >>> import math >>> math.cos(math.pi) # expected to get -1 -1.0 >>> math.cos(math.pi/2) # expected to get 0 6.123233995736766e-17 I suspect that floating point math might play a role in this, but I’m not sure how. And if …
Python: How do I print a float with a configurable number of decimals Question: I want to print some numbers and easily configure how many decimals are displayed. How do I turn something like this: import numpy as np x, y, z, s = np.random.random(4) str_out = ‘[%0.4f,t%0.4f,t%0.4f,t%0.4f]’ % (x, y, z, s) print(str_out) and …
How to maintain decimals when dividing with numpy arrays in Python Question: So, I was working on implementing my own version of the Statsitical Test of Homogeneity in Python where the user would submit a list of lists and the fuction would compute the corresponding chi value. One issue I found was that my function …
How to make that f"…" string formatting uses comma instead of dot as decimal separator? Question: I tried: import locale print(locale.locale_alias) locale.setlocale(locale.LC_ALL, ”) locale.setlocale(locale.LC_NUMERIC, "french") print(f"{3.14:.2f}") but the output is 3.14 whereas I would like 3,14. How to do this with f"…" string formatting? Note: I don’t want to use .replace(".", ",") Note: I’m looking …
Floating point arithmetic and comparison causing undesirable output Question: Consider the Pandas DataFrame df1: df1 = pd.DataFrame({"Name":["Kevin","Peter","James","Jose","Matthew","Pattrick","Alexander"],"Number":[1,2,3,4,5,6,7],"Total":[495.2,432.5,’-‘,395.5,485.8,415,418.7],"Average_old":[86.57,83.97,’-‘,96.59,84.67,83.10,83.84],"Grade_old":[‘A’,’A’,’A’,’A+’,’A’,’A’,’A’],"Total_old":[432.8,419.8,’-‘,482.9,423.3,415,418.7]}) I calculated the Average and Grade with the following formula df1["Average"] = df1["Total"].apply(lambda x: x/5 + 0.1 if x != "-" else "-") df1["Grade"] = df1["Average"].apply((lambda x:’A+’ if x!=’-‘ and x>90 else ‘A’)) So df1 becomes df1 Name …
how to increase number of floating points in python Question: I need to calculate 100 floating points of phi φ it’s defeat showing only 15 floating points but I need 100 of floating points.is there an easy way rather than implement pHi from beginning Asked By: Dileesha abilash || Source Answers: If you want more …
Hex to float and float to hex Question: I couldn’t find a working answer for the conversion of an hex to float value. Starting from this answer for converting a float to an hex float to hex, would you know how I can then convert that same hex to the original float back again? Asked …
