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Create a program that sums the diagonal of a matrix

I'm trying to create a program that sums the diagonal of a matrix that I've created. I used the code below but I don't understand whats wrong with the code I ma

interpretation of the below result obtained from R using Clm

formula: grade ~ gender + course + year + COUNT + AVERAGE + CLASS data: coded1 link threshold nobs logLik AIC niter max.grad cond.H logit flexible 160

Test host not found Xcode 13.3.1 BUILT_PRODUCTS_DIR variable changed

TL;DR $(BUILT_PRODUCTS_DIR): Was .../Products/Debug-iphoneos/... and .../Products/Debug-iphonesimulator/... in Xcode 13.3.0 Now it's .../Products/Debug/... in X

PLS-00225 subprogram or cursor '' reference is out of scope when try to read column names

I'm trying to return the column names and the value as a pair key/value like this: column_name | column_value dep_id | 1 dep_name | 'Test'

Is it ok to stack multiple CustomPainter in Flutter?

Is it ok to stack multiple CustomPainter in a Stack widget? For example: Stack( children: [ RepaintBoundary( child: CustomPaint( size: Size(

Source Documentation for Android 12 (SDK 31) is missing in Android Studio. Is there a fix/workaround?

With the newest Android 31 SDK (Android 12), the documentation for the SDK is missing. The SDK Manager shows that the "Sources for Android X" exists for SDK 30

How to prevent NetCore Web API to expose internals when Json is malformed?

When a malformed Json is sent to a NetCore Web Api method the default serializer Text.Json exposes the internal information in the error response. DTO: public r