I was asked to write a program for Linear Regression with the following steps. Load the R data set mtcars as a pandas dataframe. Build another linear regression model by considering the log of independent variable wt, and log of dependent variable mpg. Fit the model with data, and display the R-squared value …
Tag: numpy
TypeError: cannot unpack non-iterable int objec
How can I solve this error After running my code as follows . I am using the function below and implementin running window for loop on it but end up getting the error below. The for loop works and hungs at a point. I get this error How can I resolve this error? Answer Just replace return 0 by return
How to rotate square numpy array of 2 dimensional by 45 degree in python?
I have a numpy array of images. The dimension is 2 and the shape is (100,100). I want to augment more data as I have only 52 set of numpy array. I want to rotate the given array by 45 degree. What should I do for that?? Suppose the array be like Please rotate the given array by 45 degree.
Find the first and last element of a NumPy array larger than a threshold
I need to find the first and the last element of a numpy.ndarray which are above a specified threshold. I found the following solution, which works, but it looks a bit convoluted. Is there a simpler/more Pythonic way? Answer You could just access the first/last elements
remove special characters and string from df columns in python
Currently my column is of object type and I’m trying to convert it to type numeric. But it shows the error because of special characters and string contained in it. error: code: So, I want to remove the special char and string from the columns that requires only number and col1 being one of it. Any sugg…
Dataframe how to update a column based many str values
I am creating a small financial management program which imports my transactions from CSV into Python. I want to assign values to a new column ‘category’ based on strings found in the ‘details’ column. I can do it for one, but my question is how do I do it if I had a huge list of possi…
How to expand / dilate a numpy array?
I’m performing a image analysis and generated seeds in the form of a boolean array : As I want to do a subsequent analysis on the area surrounding the True value, I want to expand it (by a certain number, say pixels). This would result in the following: Is there any function or simple way of solving my …
How do I get the sum of values under a diagonal in numpy?
Given a 2D rectangular numpy array: I would like to take the sum of all values under the lower left to upper right diagonal , I.E. 8, 9 and 6. What is the best way to accomplish this? The method should work for large arrays too. Answer You can rotate, sum the upper triangle, and subtract the diagonal.
How do you produce a random 0 or 1 with random.rand
I’m trying to produce a 0 or 1 with numpy’s random.rand. np.random.rand() produces a random float between 0 and 1 but not just a 0 or a 1. Thank you. Answer You can use np.random.choice with a list of [0,1], or use np.random.radint with a range of 0,2 You can also use the random module for the equ…
Numpy Zero Padding to match a certain shape
I have a file with arrays or different shapes. I want to zeropad all the array to match the largest shape. The largest shape is (93,13). To test this I have the following code: how can I zero pad this array to match the shape of (93,13)? And ultimately, how can I do it for thousands of rows? Edit: The