Plotting Mat File In Python

The scipy s module loadmat and savemat can easily read and write the data stored in the python variable into the mat file respectively.

Plotting mat file in python.

Let s assume we need to import in python the following text file sample txt. 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. Here are examples of how to read two variables lat and lon from a mat file called test mat. 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.

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. To get corresponding y axis values we simply use predefined np sin method on the numpy array. These are more powerful and faster. Then plot the obtained data using matplotlib.

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. You can get the file used in this post here. Python build in functions read readline and readlines in general a text file txt is the most common file we will deal with. Output of above program looks like this.

Here we use numpy which is a general purpose array processing package in python. Coming from the academia the annotations for the dataset was in the mat format. Plotting curves from file data as explained earlier matplotlib only handles plotting. By the way in this spectrum mat file there are two columns e g x axis frequency and y axis scale and 401 rows.

Note that pandas dataframe plot is a convenient wrapper around matplotlib to create simple plots. 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. Reading them in is definitely the easy part. After reading a structure called e g.

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. Here is the documentation of the plot method for you to further explore. Text files are structured as a sequence of lines where each line includes a sequence of characters. Struct its lat element can.