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python numpy ValueError: operands could not be broadcast together with shapes
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dot is matrix multiplication, but * does something else.
We have two arrays:
X, shape (97,2)
y, shape (2,1)
With Numpy arrays, the operation
X * y
is done element-wise, but one or both of the values can be expanded in one or more dimension...
How to use RSpec's should_raise with any kind of exception?
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This doesn't work for me in capybara: expect { visit welcome_path }.to raise_error
– nnyby
Dec 3 '13 at 15:16
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How to import existing *.sql files in PostgreSQL 8.4?
...ostgreSQL 8.4, and I have some *.sql files to import into a database. How can I do so?
5 Answers
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How to specify font attributes for all elements on an html web page?
...re the rule doesn't make any sense. Depending on the size of the HTML this can slow the page rendering.
– Cesar Canassa
Oct 16 '10 at 7:37
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django: BooleanField, how to set the default value to true?
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If you're just using a vanilla form (not a ModelForm), you can set a Field initial value ( https://docs.djangoproject.com/en/2.2/ref/forms/fields/#django.forms.Field.initial ) like
class MyForm(forms.Form):
my_field = forms.BooleanField(initial=True)
If you're using a ModelFor...
Switch case with fallthrough?
...am looking for the correct syntax of the switch statement with fallthrough cases in Bash (ideally case-insensitive).
In PHP I would program it like:
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Recommended way to stop a Gradle build
How can I stop a Gradle build after detecting a problem? I can use an assert, throw an exception, do a System.exit (bad idea), or use a dedicated function in Gradle (but I could not find one). What is the best way for Gradle (and why?).
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Android Studio/Intellij Idea: “Table of Contents” for a class
...able of Contents" for a class. I apologize for not knowing exactly what to call it. But what I am referring to is the dropdown menu in eclipse that lists all the methods, interfaces, classes and so on that are in that class file. This then allows you to jump to that position. This view is when you a...
How to set the maximum memory usage for JVM?
...Xms<memory> -Xmx<memory>. Use M or G after the numbers for indicating Megs and Gigs of bytes respectively. -Xms indicates the minimum and -Xmx the maximum.
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How default .equals and .hashCode will work for my classes?
...(x == y has the value true).
hashCode
As much as is reasonably practical, the hashCode method defined by class Object does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation tec...