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Showing posts with the label Numpy

Construct Image From 4d List

I have a list of size (10,10,3,64) This represents a list of 64 images of size 10x10x3 I want to cr… Read more Construct Image From 4d List

Given That I Have A 2d Array And I Want To Reshape It To 1d With One Value Per Row

This is my array arr = np.array([[0, 1], [3, 4], [6, 7]]) flat_arr = np.reshape(arr, -1) am getti… Read more Given That I Have A 2d Array And I Want To Reshape It To 1d With One Value Per Row

Numpy Loadtxt Skip First Row

I have a small issue when I'm trying to import data from CSV files with numpy's loadtxt fun… Read more Numpy Loadtxt Skip First Row

How Exactly Does Numpy.where() Select The Elements In This Example?

From numpy docs >>> np.where([[True, False], [True, True]], ... [[1, 2], [3, … Read more How Exactly Does Numpy.where() Select The Elements In This Example?

How To Get The Types Of Numpy Function Arguments (from Docstrings) Using Jedi In Python

Ideally I would like a function which works as follows (for all kinds of numpy functions): paramete… Read more How To Get The Types Of Numpy Function Arguments (from Docstrings) Using Jedi In Python

How Do I Use A Specific Column's Value In A Pandas Dataframe Where Clause?

I'm trying to select all cells in a pandas DataFrame that meet a certain criteria when a specif… Read more How Do I Use A Specific Column's Value In A Pandas Dataframe Where Clause?

Does Scipy Logsumexp() Deal With The Underflow Challenge?

Does the scipy's logsumexp() implementation include the hack that prevents underflow by subtra… Read more Does Scipy Logsumexp() Deal With The Underflow Challenge?

Integrating 2d Samples On A Rectangular Grid Using Scipy

SciPy has three methods for doing 1D integrals over samples (trapz, simps, and romb) and one way to… Read more Integrating 2d Samples On A Rectangular Grid Using Scipy

Why Does This Array Has No Attribute 'log10'?

I'm trying to calculate the log10 of an ndarray, but I'm getting the following error: Attri… Read more Why Does This Array Has No Attribute 'log10'?

Swapping The Dimensions Of A Numpy Array

I would like to do the following: for i in dimension1: for j in dimension2: for k in dimensio… Read more Swapping The Dimensions Of A Numpy Array

Selecting Rows From A Numpy Ndarray

I want to select only certain rows from a NumPy array based on the value in the second column. For … Read more Selecting Rows From A Numpy Ndarray

Numpy Find Indices Of Groups With Same Value

I have a numpy array of zeros and ones: y=[1,1,1,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,1,1] I want to calcu… Read more Numpy Find Indices Of Groups With Same Value

Unpickling Objects After Renaming A Module

I have a problem loading objects via numpy.load after renaming a module. Here's a simple exampl… Read more Unpickling Objects After Renaming A Module

Filter A N-d Numpy Array And Keep Only Specific Elements

I'm dealing with a large N-D numpy array. I would like to keep only those elements present in a… Read more Filter A N-d Numpy Array And Keep Only Specific Elements

Typeerror: 'numpy.float64' Object Does Not Support Item Assignment - Similar Code, Error Raises

I am writing a Molecular Dynamics code and for that I have a function that computes forces between … Read more Typeerror: 'numpy.float64' Object Does Not Support Item Assignment - Similar Code, Error Raises

How To Solve Absolute Value Abs() Objective With Python Gekko?

An optimization problem with a squared objective solves successfully with IPOPT in Python Gekko. fr… Read more How To Solve Absolute Value Abs() Objective With Python Gekko?

Split Nested Array Values From Pandas Dataframe Cell Over Multiple Rows

I have a Pandas DataFrame of the following form There is one row per ID per year (2008 - 2015). Fo… Read more Split Nested Array Values From Pandas Dataframe Cell Over Multiple Rows

Eigenvectors Computed With Numpy's Eigh And Svd Do Not Match

Consider singular value decomposition M=USV*. Then the eigenvalue decomposition of M* M gives M* M=… Read more Eigenvectors Computed With Numpy's Eigh And Svd Do Not Match

Python Pandas From Itemset To Dataframe

What is the more scalable way to go from an itemset list:: itemset = [['a', 'b'], … Read more Python Pandas From Itemset To Dataframe

Finding False-true Transitions In A Numpy Array

Given a numpy array: x = np.array([False, True, True, False, False, False, False, False, True, Fals… Read more Finding False-true Transitions In A Numpy Array