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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.
Set Operations: The MATLAB has numerous built-in functions which perform set operations on vectors. These involve intersect, union, setdiff, unique, and setxor. All these func
Displaying the cell arrays: There are several techniques of displaying the cell arrays. The celldisp function shows all elements of the cell array: >> celldisp(cellro
For Loops which do not use an iterator Variable in the action: In all the illustrations that we seen so far, the value of the loop variable has been used in same way in the ac
Illustration of Sorting strings: To sort on the rows rather than second dimension should be specified. >> sort(words,2) ans = Hello Hdowy Hi Gbdeo
Illustration of if - else statement: The one application of an if-else statement is to check for errors in the inputs to a script. For illustration, a former script prompted t
Patch function - graphics objects: The patch function is used to generate a patch graphics object, which is made from 2-dimensional polygons. The patch is defined by its verti
Evaluating a string: The function eval is used to compute a string as a function. For illustration, below is the string 'plot(x)'is interpreted to be a call to plot the functi
IS Functions for Strings: There are many functions for strings, that return logical true or false. The function isletter returns the logical true when the character is a lette
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 t
Function strncmp: The function strncmp compares only the first n characters in the strings and ignores the rest. The initial two arguments are strings to compare, and third ar
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