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Mastering Development

Calculating line intersections with Python gave unexpected result

I have a ray casting program that finds the intersections of a ray and the edges of a polygon. In my code snippet below, I have the ray and edge in the form y = mx + b of a line. I defined a square by its vertices ((50, 50), (50, 70), (70, 70), (70, […]

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Mastering Development

How to use state space model to do prediction for dataset with multiple specific columns/variables

I have a dataset as below: import pandas as pd from datetime import datetime, timedelta def date_range(start, end): r = (end+timedelta(days=1)-start).days return [start+timedelta(days=i) for i in range(r)] start = pd.to_datetime(‘2020-01-15’) end = pd.to_datetime(‘2020-02-13’) a = pd.DataFrame({‘date’: date_range(start, end), ‘group’: [0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2], ‘type’:[‘king’, ‘name’,’is’,’true’, ‘man’, ‘king’, ‘name’,’is’,’true’, ‘man’, ‘king’, ‘name’,’is’,’true’, ‘man’, ‘king’, ‘name’,’is’,’true’, ‘man’, ‘king’, ‘name’,’is’,’true’, ‘man’, […]

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Mastering Development

How can I calculate weighted standard errors and plot them in a bar plot?

I have a data frame of counts. I would like to calculate weighted proportions, plot the proportions, and also plot standard error bars for these weighted proportions. Sample of my data frame: head(df[1:4,]) badge year total b_1 b_2 b_3 b_4 b_5 b_6 b_7 b_8 b_9 b_10 1 15 2014 14 3 2 1 1 1 […]

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User Help

Do I need to edit SCT Error Recovery Control time?

I plan to setup raid6 (lsi) or make pool(windows10). I have several hdds. === START OF INFORMATION SECTION === Model Family: Toshiba MG07ACA… Enterprise Capacity HDD Device Model: TOSHIBA MG07ACA12TE Serial Number: LU WWN Device Id: 5 000039 968caa99a Firmware Version: 0101 User Capacity: 12 000 138 625 024 bytes [12,0 TB] Sector Sizes: 512 bytes logical, 4096 bytes […]

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Mastering Development

Zebra ZD500r Calibration

I’ve been developing with the ZD500r for a year now. I still don’t understand how the the configuration/calibration options work. My questions are about the following menu options: Sensors – Manual calibration R.F.ID- R.F.ID calibrate tools – manual calibration After I do the three calibrations, I check the results by going to the IP_address of […]

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Linux Mastering Development

Swap grows slowly with 80% available memory

I think my system is swapping itself to death. There is however plenty of free memory. Can someone help me understand this? Or help me prove that this is not the issue? I have spent quite some time debugging this but have awfully little to show for it. Already established ssh sessions remain running but […]

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Database Development

Index Order Help SQLite

I have a very large sqlite table (70 million rows) on a low end machine that I am trying to properly index. My columns are timestamp, machineid, ioid and value. There are probably about 200 ioids (on each machine), a handful of machineids and timestamp is one sample per second for each ioid. My queries […]

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Mastering Development

Add value and shifting rows in data frame

I have one data frame which contain data like table below MY_DATA<-data.frame(structure(list(MY_DATA = c(10, 20, 30, 40, 50, 60, 70, 80, 90, 100)), class = “data.frame”, row.names = c(NA, -10L))) But my intention is change this table like table below, where actually instead of 10 I need to add 0 and shift all other numbers […]

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Mastering Development

Multiply each element of generic class

I have a generic class, that contains a list of type T, and I have method ‘concat’ that concatenates two objects and return new one. I need to make it concat two lists, but if the type of list Int, Double or Float it should multiply each element of list on result of func class […]

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Mastering Development

Creating a text file using keys from dictionary with multiple values

I’ve been working on compiling information for this dictionary: {‘Uranus’: [‘2750’, ‘3000’, ‘2880’], ‘Mercury’: [’46’, ’70’, ’57’], ‘Earth’: [‘147’, ‘152’, ‘150’], ‘Venus’: [‘107’, ‘109’, ‘108’], ‘Mars’: [‘205’, ‘249’, ‘228’], ‘Saturn’: [‘1350’, ‘1510’, ‘1430’], ‘Jupiter’: [‘741’, ‘817’, ‘779’], ‘Neptune’: [‘4450’, ‘4550’, ‘4500’], ‘Pluto’: [‘4440’, ‘7380’, ‘5910’]} I now am trying to write to a text file […]