Plotting Mat File In Python

Here is the documentation of the plot method for you to further explore.

Plotting mat file in python. Scipy is a really popular python library used for scientific computing and quite naturally they have a method which lets you read in mat files. The result is a numpy array. Struct its lat element can. The recommended way of plotting data from a file is therefore to use dedicated functions such as numpy loadtxt or pandas read csv to read the data.

Reading them in is definitely the easy part. To set the x axis values we use np arange method in which first two arguments are for range and third one for step wise increment. Plotting curves from file data as explained earlier matplotlib only handles plotting. Here we use numpy which is a general purpose array processing package in python.

Then plot the obtained data using matplotlib. Here are examples of how to read two variables lat and lon from a mat file called test mat. Text files are structured as a sequence of lines where each line includes a sequence of characters. To get corresponding y axis values we simply use predefined np sin method on the numpy array.

Output of above program looks like this. Note that pandas dataframe plot is a convenient wrapper around matplotlib to create simple plots. The scipy s module loadmat and savemat can easily read and write the data stored in the python variable into the mat file respectively. These are more powerful and faster.

Here we show an example to use the data from matlab in the mat format to plot in python on a geographical map which python can execute much efficiently than matlab. Matlab up to 7 1 mat files created with matlab up to version 7 1 can be read using the mio module part of scipy io reading structures and arrays of structures is supported elements are accessed with the same syntax as in matlab. After reading a structure called e g. Could anyone please let me know that why i can t plot this spectrum mat file kindly if someone show me the procedure for plotting mat files.

By the way in this spectrum mat file there are two columns e g x axis frequency and y axis scale and 401 rows. If you want to plot data stored in a file you will have to use python code to selection from matplotlib plotting cookbook book. The numbers provided to the plot method are interpreted as the y values to create the plot. Let s assume we need to import in python the following text file sample txt.