can the conditions of if or while loop be negative float numbers?

For example i want to execute

low_p can possibly contain a negative float number

if min(low_p)<-59.5

do something

end

but i am not able to do it . can anyone help me please

[Guillaume]

A condition can be anything you want as long as it evaluates to true or false. You can of course compare negative numbers of any type.

Give us an example of something that doesn't work for you and we'll tell you why and how to fix it.

Your example works fine:

low_p = [-100.56 -20.455 pi 1452.266]; %for example
if min(low_p) < -59.5
   disp('the minimum of low_p is less than -59.5')
else
   disp('the minimum of low_p is more than -59.5')
end