What does Undefined operator '-' for input arguments of type 'string' mean?

2018 6 10
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更新时间：2018 6 10
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Hi, I am a beginner user of Matlab. I keep getting " Undefined operator '-' for input arguments of type 'string'", and I have no idea how I need to fix my script. Appreciate any help resolving this issue.
Below is my script:
%NDVI = (infrared - red)./(infrared + red);
NDVIs= ("subplots(299,:)"-"subplots(195,;)")./("subplots(299,:)"+"subplots(195,:)");
Error message:
Undefined operator '-' for input arguments of type 'string'.
Error in Exercise_NDVI (line 2)
NDVIs= ("subplots(299,:)"-"subplots(195,;)")./("subplots(299,:)"+"subplots(195,:)");

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Ameer Hamza
Ameer Hamza 2018-6-10
What do you think that the line
NDVIs= ("subplots(299,:)"-"subplots(195,;)")./("subplots(299,:)"+"subplots(195,:)");
is supposed to do???

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Stephen23
Stephen23 2018-6-10

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NDVIs = (subplots(299,:)-subplots(195,:))./(subplots(299,:)+subplots(195,:));

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Chinatsu Endo
Chinatsu Endo 2018-6-10
Thanks, Stephen. I use the exact script that you shared, and it worked (no more error!)

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