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Plotting File data:
It is frequently essential to read data from a file and plot it. Generally, this entails knowing the format of the file. For illustration, let us suppose that a company has two divisions, called A &B. The file 'ab06.dat' has 4 lines in it (we will suppose this), with the sales figures in millions for the two divisions for each quarter of the year 2006. For illustration, the file may appear like this (the format will be precisely like this):
A5.2B6.4
A3.2B5.5
A4.4B4.3
A4.5B2.2
The script below reads the data and plots in one Figure Window the data as the bar charts. The script prints an error message when the file open is not successful or when the file close was unsuccessful. The axis command is used to force the x-axis to range from 0 to 3 and the y-axis from 0 to 8 that will result in the axes shown here. The numbers 1 and 2 would display on the x-axis instead of the division labels A and B by default. The set function modifies the XTickLabel property to use the strings in the cell array as labels on the tick marks on the
x-axis; and gca returns the handle to the axes in the present figure (it stands for "get present axes").
Running this generates the subplot as shown in figure.
Appending variables to the Mat-File: Appending to the file adds to what has been saved in a file, and is accomplished by using the -append option. For illustration, supposing
Use of While loop: Here is an illustration of calling the function, passing 5000 for the value of the input argument high. >> factgthigh(5000) ans = 5040 The itera
Subfunctions: Though, it is possible to have more than one function in a given M-file. For illustration, if one function calls the other, the first function would be the prima
Vectors of Structures: In numerous applications, involving database applications, information generally would be stored in the vector of structures, instead of in individual s
Expanding a function: The expand function will multiply out terms, and factor will do the opposite: >> expand((x+2)*(x-1)) ans = x^2 x-2 >> factor(ans)
Passing arguments to functions: In all these functions examples faraway, at least one of the arguments was passed in the function call to be the value(s) of the equivalent inp
A matlab function to calculate filter order
Creating Cell arrays: There are many ways to create cell arrays. For illustration, we will create a cell array in which one element will store an integer, one element store ch
Removing Whitespace Characters: The MATLAB has functions which will eliminate trailing blanks from the end of a string and/or leading blanks from the starting of a string.
Illustration of Variable scope: Running this function does not add any of variables to the workspace, as elaborated: >> clear >> who >> disp(mysum([5 9 1]))
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