PyQtGraph – Setting Origin Value of Error Bar Graph
In this article, we will see how we can set the co-ordinate value of the error bar graph in the PyQtGraph module. PyQtGraph is a graphics and user interface library for Python that provides functionality commonly required in designing and science applications. Its primary goals are to provide fast, interactive graphics for displaying data (plots, video, etc.). Error bars are graphical representations of the variability of data and used on graphs to indicate the error or uncertainty in a reported measurement. They give a general idea of how precise a measurement is, or conversely, how far from the reported value the true value might be. The co-ordinate value of the error bar graph is the x, y co-ordinate it can be set with the help of setX and setY method.
We can create a plot window and create an error bar graph on it with the help of commands given below.
# creating a pyqtgraph plot window plt = pg.plot() # creating a error bar item object error = pg.ErrorBarItem(x=x, y=y, top=top, bottom=bottom, beam=0.5)
In order to do this we use setX and setY method with the error bar item object
Syntax : error.setX(x) and error.setY(y)
Argument : It takes float value as argument
Return : It returns None
Below is the implementation.