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## How can we find text that matches in two columns and find differences of numbers?

I have this data in ColumnA: 6,897,661 US 5,646,010 India 4,591,364 Brazil 1,117,487 Russia 777,537 Colombia 768,895 Peru 705,263 Mexico 682,267 Spain 663,282 South Africa 652,174 Argentina I have this in ColumnB: 8,217,952 US 7,597,063 India 5,250,727 Brazil 1,422,775 Russia 1,002,662 Argentina 974,449 Spain 965,883 Colombia 952,600 France 868,675 Peru 854,926 Mexico In ColA Argentina […]

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## Can you synchronize & time signals over long distance?

I’m working on a (over-engineered) project which involves having a storage depot before a station in which trains wait until a space is free at the station. I’ve done all the infrastructure and I need a solution with the signaling & logic behind the system. Here is the infrastructure: On the top left you can […]

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## Can you synchronize & time signals over long distance?

I’m working on a (over-engineered) project which involves having a storage depot before a station in which trains wait until a space is free at the station. I’ve done all the infrastructure and I need a solution with the signaling & logic behind the system. Here is the infrastructure: On the top left you can […]

Categories

## Can you synchronize & time signals over long distance?

I’m working on a (over-engineered) project which involves having a storage depot before a station in which trains wait until a space is free at the station. I’ve done all the infrastructure and I need a solution with the signaling & logic behind the system. Here is the infrastructure: On the top left you can […]

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## In minecraft, how do I construct a 4-bit comparator?

4-bit comparators are a basic building block in electronics, and useful in many redstone devices, in particular computers. I’m interested in a good overview of the construction this type of device. It takes eight signals as input: a0, a1, a2, a3, b0, b1, b2, b3; and outputs 2 signals: a<b, a=b with a>b = !(a<b). […]

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## In minecraft, how do I construct a 4-bit comparator?

4-bit comparators are a basic building block in electronics, and useful in many redstone devices, in particular computers. I’m interested in a good overview of the construction this type of device. It takes eight signals as input: a0, a1, a2, a3, b0, b1, b2, b3; and outputs 2 signals: a<b, a=b with a>b = !(a<b). […]

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## pandas merge as of on one column, exactly on other columns?

I am trying to merge 2 dataframes, with exact matching on some columns and as_of matching on some other column (typically a date). The intention is very well described in this post (I’ll copy paste the main content below): Pandas: Approximate join on one column, exact match on other columns The post above was answered […]

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## In minecraft, how do I construct a 4-bit comparator?

4-bit comparators are a basic building block in electronics, and useful in many redstone devices, in particular computers. I’m interested in a good overview of the construction this type of device. It takes eight signals as input: a0, a1, a2, a3, b0, b1, b2, b3; and outputs 2 signals: a<b, a=b with a>b = !(a<b). […]

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## Fast way to remove array of specific row values from 2D numpy array

I have a 2D array like this: a = np.array([[25, 83, 18, 71], [75, 7, 0, 85], [25, 83, 18, 71], [25, 83, 18, 71], [75, 48, 8, 43], [ 7, 47, 96, 94], [ 7, 47, 96, 94], [56, 75, 50, 0], [19, 49, 92, 57], [52, 93, 58, 9]]) and I want to […]

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## python datatable, string manipulation on column

from datatable import dt, f, g, by, update, join, sort tt = dt.Frame({‘a’ : [‘A1′,’A2′,’A3’], ‘b’:[100,200,300]}) print(tt) | a b — + — — 0 | A1 100 1 | A2 200 2 | A3 300 [3 rows x 2 columns] How can I remove the ‘A’ in the a column and assign it to […]