# How to prevent Floating-Point errors with Pandas

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 column to float64 df[data_column] = df[data_column].astype("float64") After that… Read More How to prevent Floating-Point errors with Pandas

# Check for infinity while using -Wfloat-equal?

My pet project uses -nostdlib so I can’t use any C libraries however I can include them for constants. Below is my code. If I compile using gcc -Wfloat-equal -nostdlib -O2 -c a.c on gcc or clang it’ll give me the error below. I was curious if there’s a way to check without triggering this… Read More Check for infinity while using -Wfloat-equal?

# How to use big.js?

From the examples of big.js they show this example 0.3 – 0.1 // 0.19999999999999998 x = new Big(0.3) x.minus(0.1) // "0.2" x // "0.3" x.div(y).plus(z).times(9).minus(‘1.234567801234567e+8’).plus(976.54321).div(‘2598.11772’) Which is a very simple example. In my case I would like to calculate res = a + (b / c) + (d + 1) / (e * f *… Read More How to use big.js?

# Building code for counting the number of decimal places in Java

I am now trying to build a source code for counting the number of decimal places of floating point value input by the user. Below is my code written in Java: import java.util.Scanner; import java.lang.Math; class CountDecimalPlaces{ public static void main(String[] args){ Scanner input = new Scanner(System.in); double double1 = input.nextDouble(); int int1 = (int)… Read More Building code for counting the number of decimal places in Java

# Why does underflow with floating points happen at 2^-126?

When representing a float, why does the exponent face underflow when it hits 2^-126 if 8 bits can hold everything from -127(incl.) to 128(incl.)? >Solution : Exponents range from −126 to +127 because exponents of −127 (all 0s) and +128 (all 1s) are reserved for special numbers. wikipedia

# How many float-pointing types in c?

As many programmers know there are several floating-point types in c. So far I know float, double and long double but I’m not quite sure they are all of them, cause I found several definitions like __DEC32_MAX__. At first I thought that is another name for __FLT_MAX__ but when I tried to print it, I… Read More How many float-pointing types in c?

# Not able to 'numpy.float64' to int in python

I am trying to convert ‘numpy.float64’ to float to do this: ax.get_ylim().astype(float) Which prints out -2.25 But when I check with type(ax.get_ylim().astype(float)) it is printing out numpy.float64. Why is it not changing the data type? >Solution : Can you try the following: float(ax.get_ylim())

# Can't convert string to float because of '.'?

I need to round the string values of a column in my dataframe up to 2 decimal cases, so I started by converting them to floats using astype(float) and then using round(2). Ex: df[‘col’] = df[‘col’].astype(float).round(2) But I’m getting the following error: ValueError: could not convert string to float: ‘.’ I thought the dots would… Read More Can't convert string to float because of '.'?

# sort function in python doesn't work for long list?

a=[‘0’, ‘0.05’, ‘0.1’, ‘0.15’, ‘0.2’, ‘0.25’, ‘0.3’, ‘0.35’, ‘0.4’, ‘0.45’, ‘0.5’, ‘0.55’, ‘0.6’, ‘0.65’, ‘0.7’, ‘0.75’, ‘0.8’, ‘0.85’, ‘0.9’, ‘0.95’, ‘1’, ‘1.05’, ‘1.1’, ‘1.15’, ‘1.2’, ‘1.25’, ‘1.3’, ‘1.35’, ‘1.4’, ‘1.45’, ‘1.5’, ‘1.55’, ‘1.6’, ‘1.65’, ‘1.7’, ‘1.75’, ‘1.8’, ‘1.85’, ‘1.9’, ‘1.95’, ’10’, ‘10.05’, ‘10.1’, ‘10.15’, ‘10.2’, ‘10.25’, ‘10.3’, ‘10.35’, ‘10.4’, ‘10.45’, ‘10.5’, ‘10.55’, ‘10.6’, ‘10.65’, ‘10.7’,… Read More sort function in python doesn't work for long list?

# Python multiplying decimals less than 1

I am trying to multiply two decimals but Python 3 does not seem to respect the fact the numbers are decimals. The basic code I have is: val1 = 0.00141643059490085 val2 = 0.00623423464234545 Res = val1 * val2 print(str(Res)) The result I am getting is 8.830360683208854e-06 which obviously is not correct. It appears to be… Read More Python multiplying decimals less than 1