MATLAB String Input If statment

Question

I'm trying to make a program that asks a yes or no question. Based on that answer the program will continue or terminate. I keep getting an error since the arrays don't have the same dimension. I tried to use strcmp() but failed. I don't understand how true or false will help me discriminate between different words and capitalization. (Do I have to test each letter?) I want the program to continue if the input is any of these words 'yes','YES','Yes','y' and quit if the input is 'no','NO','No','n' I really want to understand, the == feels wrong somehow. Thank You

ZZ=input('Do you want to know when you''ll turn 100?: ', 's');
NN={'no','NO','No','n'}
YY={'yes','YES','Yes','y'}

XX=strcmp(ZZ(NN),ZZ(YY)); %I thought this line would let MATLAB know everything is ok

if ZZ=='no' || ZZ=='NO' || ZZ=='No' || ZZ=='nO' || ZZ=='n'
 disp('Thank You.') 
 disp('Come again.')

elseif ZZ=='yes' || ZZ=='YES'|| ZZ=='Yes'|| ZZ=='y'

 x=input('Enter your age: '); %x is your age.
 .....

Just check the first letter, if 'n', then no, if 'y' then yes. You can use case insensitive with strcmpi. — Matt
– Matt, Commented Oct 13, 2017 at 18:50
Another fun option is questdlg. It opens a customizable window that you can click the Yes or No button. — Matt
– Matt, Commented Oct 13, 2017 at 18:55
Thanks for the suggestion. I want to use this concept for larger words. Is this a good idea? — Tony Rios
– Tony Rios, Commented Oct 13, 2017 at 22:30

Nivi · Accepted Answer · 2017-10-13 19:46:02Z

1

I think if you need your program to run more than once, you need a for or while loop.

zz = 'yes';
while strcmpi(zz(1),'y')       
    x = input('Enter your age: ');   
    zz = input('Do you want to know when you''ll turn 100?: ', 's'); 
end

edited Oct 13, 2017 at 19:46

answered Oct 13, 2017 at 18:55

Nivi

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5 Comments

Matt Over a year ago

You don't handle the ZZ = y case. strcmpi('y','yes') == 0

Nivi Over a year ago

The assumption is that the user enters a yes or no.

sco1 Over a year ago

The problem statement is pretty explicit: I want the program to continue if the input is any of these words 'yes','YES','Yes','y'

Tony Rios Over a year ago

Does this while loop compare the first element of the array (zz) with the letter 'y'? Since this is true the loop runs. Does this mean that I can more letters to 'strcmpi' ? (say strcmpi(zz(n),'n', 'N','o','y','Y',.....)

Nivi Over a year ago

Well, anything that doesn't start with 'y' will make the condition false and the program will not run. If you are asking to include multiple true conditions, then there are other ways to do it.

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