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Mastering Development

How to pivot_long pairs of date-var combinations with non-matching dates?

Here is my toy data. df <- tibble::tribble( ~date1, ~A Equity, ~date2, ~B Equity, ~date3, ~C Equity, “1/29/2016”, 35, “10/31/2017”, 67, NA_character_, NA_real_, “2/29/2016”, 40, “11/30/2017”, 31, NA_character_, NA_real_, NA_character_,NA_real_, “12/29/2017”, 56, NA_character_, NA_real_) The real one has over 1000 columns and many more dates. I want to long the data so that the desired […]

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Development Linux

Why are loop variables not being comprehended in this basic bash for loop?

$ bash -c “for VAR in {0..9}; do echo $VAR; done; And a shell script containing exactly what’s in the quotes behaves as expected. The result is 10 blank lines – no matter which way I mildly edit this line (i.e. /bin/bash or sh instead of bash, or using ${VAR}, “$VAR”, “${VAR}”, or a different […]

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Development Linux

Virtual Directories in Linux

Why the directories under ROOT (/), like bin, boot, etc, home, root, var,… called virtual directories? As they exist actually on the system?

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Development

Cannot figure out how to send data to hat switch from stm32f103c8 to PC via USB

I have recently restarted to play around with micro controllers and finally got kinda stuck. So what I am building is a custom game pad. I can simulate data correctly for buttons but nothing works when I bring in the hat switch. I assume I am sending wrong data packet but cannot figure out the […]

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Development Linux

For a file, list all mounts to root

I have a file which I would like to access within a container. The full path jumps from one disk to another. This means that through trial and error, I keep adding more bind points until it works. I’d like a better way. Is there an automated way to find that list. Visually, I can […]

Categories
Development Linux

For a file, list all mounts to root

I have a file which I would like to access within a container. The full path jumps from one disk to another. This means that through trial and error, I keep adding more bind points until it works. I’d like a better way. Is there an automated way to find that list. Visually, I can […]

Categories
Development

Efficiently mask and calculate means for multiple groups in `xr.Dataset` xarray

I have two xr.Dataset objects. One is a continuous map of some variable (here precipitation). The other is a categorical map of a set of regions [‘region_1’, ‘region_2’, ‘region_3’, ‘region_4’]. I want to calculate the mean precip in each region at each timestep by masking by region/time and then outputting a dataframe looking like the […]

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Development

Efficiently mask and calculate means for multiple groups in `xr.Dataset` xarray

I have two xr.Dataset objects. One is a continuous map of some variable (here precipitation). The other is a categorical map of a set of regions [‘region_1’, ‘region_2’, ‘region_3’, ‘region_4’]. I want to calculate the mean precip in each region at each timestep by masking by region/time and then outputting a dataframe looking like the […]

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Development

Trying to install keras & tensorflow on an Amazon AWS Instance

I am running into some problems when trying to install keras and tensorflow on a Ubuntu EC2 Instance. I load in the library and try to install keras. library(keras) library(tensorflow) install_keras(tensorflow = “gpu”) I obtain the following error: Error: could not find a Python environment for /usr/bin/python I have also ran the following along with […]

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Development

Matlab – Evaluating a multiple-input anonymous function with a single vector [duplicate]

This question already has an answer here: How to use a vector argument for a function generated by matlabFunction 2 answers I am trying to evaluate a MatlabFunction with a single vector, meaning that this vector would hold a value for each variable in that MatlabFunction. To use a simple example, I can define a […]