Invalid expression, can anybody help me

x=('heart rate');

switch (x)

        case 70

            disp('normal')

        case 100

            disp('HHR')

        case 50

            disp('LHR')

        otherwise

            disp('abnormal')
end

[Stephen23]

The code you show does not throw an error (even if it does not do anything useful):

x=('heart rate');
switch (x)
    case 70
        disp('normal')
    case 100
        disp('HHR')
    case 50
        disp('LHR')
    otherwise
        disp('abnormal')
end

abnormal

Answer 1

[Jan]

What is the purpose of:

x=('heart rate');

Afterwards x is the CHAR vector 'heart rate' and you compare it to numerical values. Of course no numberical value matchs this char vector.

Please post the complete message, which mentions the failing line also. The readers cannot guess, which expression is invalid.