if else statement with strings

I want to take the user input and check if it is:

if the user input 'high pass' -> calcute this equation:GpRC = tf(R*C,1 + R*C);

if the user input 'low pass' --> calcute this equation:GpRC = tf(1,1 + R*C);

and then plot the true statement

this is the code:

%Make the user choose the filter

msgout = 'Choose from (high pass / low pass) \n';

%Calculate the gain

filter_option = input(msgout);

if strcmp(filter_option,'high pass')

GpRC = tf(R*C,1 + R*C);

plot(f_c,GpRC)

elseif strcmp(filter_option,'low pass')

GpRC = tf(1,1 + R*C);

plot(f_c,GpRC)

else

disp('Error!')

end

[Riccardo Scorretti]

You didn't ask a question. In MATLAB Answers, users ask a precise question on a technical issue concerning MATLAB.

[Dyuman Joshi]

What exactly is the problem you are facing?

[Badr Al-Sabri]

--> msgout = 'Choose from (high pass / low pass) \n';

When I write "high pass"

I am getting an error

Answer 1

[Riccardo Scorretti]

That's being said, your problem is (most probably) that you wish to ask the user to enter a string:

filter_option = input(msgout);

In this case, you must add the second argument 's' to input, otherwise input will look for a numerical value or a numerical expression:

filter_option = input(msgout, 's'); % *** add 's' as second argument ***

[Badr Al-Sabri]

Thank you

It worked

[Riccardo Scorretti]

You are welcome