errorcalcs 0.3.4

GUI for error calulations

"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 usage.md
• 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

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 'calc.py' 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

Requirements

• Python >= 3.4
• uncertainties
• PyQt5

Installation

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
run\_e\_c()