MATLAB command clear

MATLAB is a mathematical programme developed by the company called The MathWorks Inc. Examples in this chapter have been tested on MATLAB versions between 201 la and 2015b. It is expected that most of the commands presented will work with some earlier versions, as well as most later versions. It will be assumed that the reader has a basic understanding of MATLAB, can write MATLAB statements, understands basic MATLAB commands, and can plot a simple MATLAB graph. This chapter will examine in detail additional features, such as the different toolboxes and formatting features. In order to clearly distinguish between the code required for the MATLAB function and text, all MATLAB commands and variables are shown in bold Courier New. 

Instead of the MATL AB command mode, one could also use the identification graphical user interface (ID-GUI) to identify the model. Type clear and clc in the MATLAB command window to clear the workspace. Then type load pll to load the data and whos to see the variable names, they should be JTand T. Now type ident to start the ID-GUI after which Fig. 24.6 should appear. 

The clear command rids MATLAB from variables. If you want to remove a specific variable, then invoke the clear command followed by the name of that variable. For example, if you want to get rid of my ans variable then use... 

Do not give a script file the same name as a variable it computes, because MATLAB will not be able to execute that script file more than once unless the variable is cleared. Recall that typing a variable name at the command prompt causes MATLAB to display the value of that variable. If there is no variable by that name, then MATLAB searches for a script file having that name. For example, if the variable qroots is created in a script file having the name qroots.m, then after the script is executed the first time, the variable qroots will exist in the MATLAB workspace. If the script file is modified and an attempt is made to run it a second time, MATLAB will display the value of qroots and will not execute the script file. 

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