## Question:

I tried to create some numbers and rename the output columns with the`np.arange`

loop as the following:The columns’ names were fine between columns

`reject0.6-reject0.68`

.
After that, all columns’ names turned to `reject`

with the unexpected numbers, e.g., `reject0.6900000000000001`

, `reject0.8000000000000002`

, `reject0.9900000000000003`

for all other columns as the attached the picture shows.[column names]

I am curious why the numbers are different after 0.69. I tried to simply replace

`np.arange`

with `np.linspace`

, but it doesn’t work for me.
Am I wrong with any part?I appreciate any help you can provide.

## Answer:

You are seeing the tail of the floating point precision. It is impossible to exactly represent most floats, and we end up with a tail that end at the numeric precision.I think you can solve this by formatting the strings you are using for column names.

If you have better answer, please add a comment about this, thank you!