Skip To Main Content
QgsExpression ContextUtils on Muck Rack

QgsExpression ContextUtils

Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work. Claim your profile

Get in touch with QgsExpression

Contact QgsExpression, search articles and posts on X, monitor coverage, and track replies from one place.

Learn more about Muck Rack

Actions

Share this page

Is this you?

As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.
Claim your profile

Articles

Empty @layer_name variable in QGIS expression using the "Geometry by expression" tool

|
By QgsExpression ContextUtils, QgsProcessing Algorithm, QgsProcessing Exception, Nyall Dawson'
| stackexchange.com
This is a bug (#54869) with no workaround other than hardcoding the layer. An alternative to using the native (C++) Geometry By Expression tool is to modify the old python Geometry By Expression tool from QGIS 3.10 and add the missing layer scope to the expression context using QgsExpressionContextUtils.layerScope.
Open in Who Shared Issue with article?

Why PyQGIS is not calculating the square root correctly in this expression

|
By QgsExpression Context, QgsExpression ContextUtils
| stackexchange.com
I have a shapefile with ~100 fields, the first ~50 fields are motion towards the east, and the last ~50 are motion towards the north. There are 50 fields because each represents a date. I want to calculate the displacement using a simple formula (d= sqrt((east * east)+(north * north)). Below is a sample of the shapefile As I need to repeat this at least 50 times I am using the Python script in QGIS to create and calculate the new fields.
Open in Who Shared Issue with article?

Problem joining two python scripts + QMessageBox + Chi-square + vector tools

|
By QgsDouble SpinBox, QMessage Box, QgsExpression Context, QgsExpression ContextUtils
| stackexchange.com
I created a model that combines two vector layers and outputs a single layer with aggregated data, after that, is calculated chi-square test. I tried join both, but I can´t. Now, when it´s executed, it crash QGIS. Could someone look it? """ Model exported as python.
Open in Who Shared Issue with article?
See all 5 articles