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# Category Archives: Python

## 3D Printing a dome house

(1/9/2021) I caught up in life and stopped programming some years ago. I’m uncertain when will I finish the project. I have requested few times about the source code. Here is the link of github repository. https://github.com/ghpenguin/workshop (old) I’ve … Continue reading

Posted in GNU/Linux, Python, Science and technologies
Tagged engineering, geodesic dome, Geodome, house project, python 3.x
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## Extracting numbers using regular expression

It took hours to understand how the regular expression works. I briefly explains the symbols in the codes. . any single character ? zero or one of the previous character + one or more of the previous character * zero … Continue reading

## Build IPython for Python 3.x

I use IPython as SymPy interface which serves as command-line CAS (Computer Algebra System) application. It’s one of critical software I depend on whenever I study mathematics. I decided to uprade IPython for Python 3.x because I felt making Python … Continue reading

Posted in GNU/Linux, Python
Tagged CAS, Devuan, ipython3, matplotlib, module installation, numpy, pip3, python-pip3, python3.4, SymPy
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## Starting ipython for interactive sympy

$ ipython –pylab Python 2.7.10+ (default, Oct 10 2015, 09:11:24) Type “copyright”, “credits” or “license” for more information. IPython 2.3.0 — An enhanced Interactive Python. ? -> Introduction and overview of IPython’s features. %quickref -> Quick reference. help -> Python’s … Continue reading

## ztouch – create empty files

Out of necessity I built a simple program that create many empty files. I put few examples how to use it in the code. Below command create exactly 1,000 empty files which mimic Nikon D200’s image files. The first file … Continue reading

Posted in GNU/Linux, Python
Tagged command line utility, create empty files, Debian Wheezy, programming, python, touch, ztouch
1 Comment

## sympy – find equations for the lines that are tagent and normal to the curve at (1, 2).

Chapter 2 Practice Exercises, p183

Posted in Python
Tagged Calculus, mathematics, normal line, python, SymPy, tangent line
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## sympy – changing graph color of plot()

plot() handles color names for RGB color codes. SymPy document doesn’t explain it clearly or sample codes don’t exit. Here is another example.

## sympy – sawtooth function

Calculus and Analytic Geometry, George B. Thomas and Ross L. Finney Exercises 2.5 81, p163 s = 0.78540 – 0.63662*cos(2*t) – 0.07074*cos(6*t) – 0.02546*cos(10*t) – \ 0.01299*cos(14*t) plot(s, (t, -pi, pi)) dsdt = 1.27324*sin(2*t) + 0.42444*sin(6*t) + 0.2546*sin(10*t) + 0.18186*sin(14*t) … Continue reading

Posted in Python, Science and technologies
Tagged Calculus, cos(x), derivative, mathematics, python, sawtooth function, sin(x), step function, SymPy
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## sympy – appling the chain rule manually to find derivative of a function.

I spent few hours to figure out how to apply the chain rule manually to find derivative of a function due to poor documentation of SymPy. I’m not that smart guy.