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This tutorial will discuss the use of command in Matlab clearto clear variables from memory.

Use the command in MATLAB clearto clear variables from memory.

To clear the variables from Matlab's memory or workspace, Matlab provides a built-in command clear. If we want to clear all the available variables from Matlab workspace on memory, we can use the clear command. For example, let us remove all the variables from the workspace using the clear command. See the code below.

>> clear

You can use the clear command in the command window and in script files clear. If we use it at the beginning of the code, when we run the code, Matlab clears all the previously stored variables. Only 清除the variables generated after the command are saved in the workspace or memory. If we use the clear command at the end of the code, then all the variables generated during the execution of the code are removed from the workspace or memory. If we do not want to clear all the variables, but we want to clear some specific variables, we can use the clear command and the variable name to remove that variable from the memory. For example, if the variable name is MyMatrix, we can use the clear command and MyMatrixthe variable name to clear the variable from the memory. For example, let us create a matrix and then cleardelete it using the clear command and the variable name. See the code below.

>> MyMatrix = [1 2 3];
>> clear MyMatrix

When you write the first line of code in the command window of Matlab, the variables MyMatrixwill be saved in the workspace. When you write the second line in the command window of Matlab, the variables MyMatrixwill be deleted from the workspace or memory. This command will only delete the variable whose name is used, all other variables will remain in the workspace or memory. You can also write multiple names in one line separated by spaces to delete them from the workspace or memory.

You can also delete certain types of items using item types. For example, we can clear all functions or classes or variables. clearThe function command will clear all functions present in the memory, while clearthe class command will delete the class present in the memory. For example, see the code below.

>>clear functions

If we don't know the names of some variables, we can also use expressions and Matlab will delete the variables that match the expression. For example, let's create two variables MyMatrixand MyMatrix2and Mydelete them using the name . See the code below.

>> MyMatrix = [1 2 3];
>> MyMatrix2 = [1 2 3];
>> clear -regexp ^My

The variables MyMatrixand MyMatrix2will be removed from the workspace because they contained at the beginning My. You can also write multiple expressions on the same line. Make sure to save some type of result before clearing the variables.