How can strings be used in an if loop?

Question

Nathan Costin 2016-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/295168-how-can-strings-be-used-in-an-if-loop

回答： Tom Hawkins 2018-11-14

I am trying to use a string to create an if loop for a programme that analyses an image. I'm getting this string from a prompt then just placing in a test to see if my code has worked. Can anyone give me any pointers as to how to get this to work? My code is attached

prompt1 = 'Would you like to remove edge effects (Y/N)?'
ans1 = input(prompt1)
if ans1 = 'Y'
    x = 5*5
elseif ans1 = 'N'
    x = 5/5
end

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Answer 1

the cyclist 2016-7-12

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编辑：the cyclist 2016-7-12

在 MATLAB Online 中打开

prompt1 = 'Would you like to remove edge effects (Y/N)?';
ans1 = input(prompt1,'s');
if strcmpi(ans1,'y')
    x = 5*5
elseif strcmpi(ans1,'n')
    x = 5/5
end

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Nathan Costin 2016-7-12

thank you!

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Answer 2

Image Analyst 2016-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/295168-how-can-strings-be-used-in-an-if-loop#answer_228434

You'd need to use ans1 == 'Y' (two equal signs) or else use the string compare function strcmpi(ans1, 'Y').

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Answer 3

Tom Hawkins 2018-11-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/295168-how-can-strings-be-used-in-an-if-loop#answer_346865

在 MATLAB Online 中打开

Alternatively…

prompt1 = 'Would you like to remove edge effects (Y/N)?'
ans1 = input(prompt1)
switch ans1
    case {'Y', 'y'}
        x = 5*5
    case {'N', 'n'}
        x = 5/5
    otherwise
    % the input was neither of the above
end