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Display image as grayscale using matplotlib
I'm trying to display a grayscale image using matplotlib.pyplot.imshow() . My problem is that the grayscale image is displayed as a colormap. I need the grayscale because I want to draw on top of the image with color.
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Pass a data.frame column name to a function
I'm trying to write a function to accept a data.frame ( x ) and a column from it. The function performs some calculations on x and later returns another data.frame. I'm stuck on the best-practices method to pass the column name to the function.
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How to compare Unicode characters that “look alike”?
I fall into a surprising issue.
10 Answers
10
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What does .SD stand for in data.table in R
.SD looks useful but I do not really know what I am doing with it. What does it stand for? Why is there a preceding period (full stop). What is happening when I use it?
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How can I do an UPDATE statement with JOIN in SQL Server?
I need to update this table in SQL Server with data from its 'parent' table, see below:
16 Answers
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Remove all special characters from a string [duplicate]
I am facing an issue with URLs, I want to be able to convert titles that could contain anything and have them stripped of all special characters so they only have letters and numbers and of course I would like to replace spaces with hyphens.
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How to get all enum values in Java?
I came across this problem that I without knowing the actual enum type I need to iterate its possible values.
7 Answers
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Can someone explain the right way to use SBT?
I'm getting out off the closet on this! I don't understand SBT. There, I said it, now help me please.
4 Answers
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Why do I need to do `--set-upstream` all the time?
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A shortcut, which doesn't depend on remembering the syntax for git branch --set-upstream 1 is to do:
git push -u origin my_branch
... the first time that you push that branch. Or, to push to the current branch to a branch of the s...
Reading an Excel file in python using pandas
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Close: first you call ExcelFile, but then you call the .parse method and pass it the sheet name.
>>> xl = pd.ExcelFile("dummydata.xlsx")
>>> xl.sheet_names
[u'Sheet1', u'Sheet2', u'Sheet3']
>>> df = xl.parse("She...