matlab struct initialization issue

2020 11 4
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更新时间：2020 11 4
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I'm trying to initialize a strut which would have fields that represent age groups like <39, 40-49, 50-59 and so on. So I tried the following
x = struct('below39',{},'AG 40 to 49',{}); but it gives me an invalied field name error. I also tried
x = struct('below39',{}); and that worked. I'm not sure why is this an issue. Any insights would eb helpful.

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Ameer Hamza
Ameer Hamza 2020-11-4
编辑：Ameer Hamza 2020-11-4

1 个投票

In MATLAB, the struct fieldnames cannot have spaces. The following will work
x = struct('below39',{},'AG_40_to_49',{})
Read here about rules to for creating a fieldname: https://www.mathworks.com/help/matlab/ref/struct.html#d122e1258552

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Anmol Pardeshi
Anmol Pardeshi 2020-11-4
Thanks Ameer. Although one more thing worth noting is that the first character must be a alphabet and not number. In that light, '40_to_49' would not work. It should start with a alphabet.
per isakson
per isakson 2020-11-4
See matlab.lang.makeValidName and isvarname()
Ameer Hamza
Ameer Hamza 2020-11-4
@Anmol Pardeshi, yes. The link mentions the rules to define a fieldname.
@Per Isakson, Thanks for the information.

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