when i run matlab code this sentence appear?

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关闭： MATLAB Answer Bot 2021-8-20

when i run the code this sentence 'Undefined function or variable 'f'.' and this happens for all variable

how can i fixed the problem????

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Azzi Abdelmalek 2016-4-4

This message occurs when you use variables that are not defined. For example:

y=5*t

How Matlab will calculate 5*t if the variable t is not defined. the correct code is for example

t=10
y=5*t

Walter Roberson 2016-4-4

编辑：Walter Roberson 2016-4-4

If you had that line in a function, then the variable would be removed from the workspace as soon as that function returned.

Also, if you have a "clear" then you might be destroying the values. You should almost never have "clear all" in a program.

If i clear the variable from workspace how can restore it ???

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