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GUI for error calulations

Project description

Python 3.7 license


"ErroRCalcS" is a GUI-tool to calculate uncertainties by using the uncertainties and the PyQt5 packages.

update 0.3.1

In version 0.3.1 there are some new features:

  • you can chose now where to save the formula file via the 'save here'-button
  • you can open the file directly by clicking 'open'
  • the Program checks the internetconnection in order to chose from where to open the
  • completely new structure: some functions have been moved from GUI. py and calc. py to a new script (add. py) to make the program code easier to read.

Furthermore some bugs were fixed.

Usage / funktion

The aplication starts with a window with different input fields (see picture below):

  • variable (name of variable, e.g. d)
  • value (Value of variable e.g. 7.1)
  • error (correspondending error on the variable, e.g. 0.8 or 0,8)
  • formula (desired formula, using the variables and further values and arithmetic characters

Screenshot of ErroRCalcS' main window

By clicking on the 'add-variable' button, the entries are written to files in a folder named '.__log__'. By clicking on the 'calculation' button, the formula entry is also written to a file in the '.__log__' and '' starts running, and writes the calculation and the result in files into the '.__log__'. Variables can be overwritten.

By selecting a format behind 'Safe used Formula for' the used formula for error propagation is written into a file named 'saved_formula.txt' in the current directory. By clicking the 'save-here'-button you can chose, where to save the used formula. Clicking the 'open'-button leads directly to the file where the formula was saved in.

If LaTex is selected, the formula is also written to the .txt file. You can copy this into a .tex document. If you import there the 'amsmath' module (\usepackage{amsmath}), you can use this formula without editing.

Input and Result Examples

General Inpus

variable value error formula result
V, T, n 2, 283.5, 4.3 0, 0.5, 0.03 (n*8.314*T)/V 5067.591+/-36.467
x 4.3 1.1 sin(x)*3.5 -3.2066+/-1.5431
y 3.254 0.032 log10(y) 0.5124175+/-0,0042709
x, y 4.3, 3.254 1.1, 0.032 log(x)**y 3.4156+/-1.9497

Arithmetic Characters

characters and operators meaning example
+ plus 4+2=6
- minus 4-2=2
* multiplication 4*2=8
/ division 4/2=2
** exponent 4**2=16
sqrt(x) square root sqrt(4)=2
log(x) natural logarithm log(2.71828)=1
logY(x) logarithm with base Y log10(2.71828)=0.4343
sin(x) sinus in radian sin(1)=0.8415
cos(x) cosinus in radian cos(1)=0.5403
tan(x) tangens in radian tan(1)=1.5574
asin(x) arcsinus in radian asin(1)=1.5707
acos(x) arccosinus in radian acos(1)=0
atan(x) arctangens in radian atan(1)=0.7854
exp(x) exponentialfunktion of e^(x) exp(2)=7.3891


  • Python >= 3.4
  • uncertainties
  • PyQt5


errorcalcs can be installed by pip3 install errorcalcs (Linux) or simply pip install errorcalcs (Windows). You can run the GUI with following code:

from errorcalcs.errorcalcs import run\_e\_c

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