Using Matlab App Designer, error using drop down list. Incompatible array sizes.
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Im atttempting to use a drop down list to select a country, which will pull information from a website and populate an Edit Field(text). The code works for the first two countries, when I use the third I get an incompatible array size error.
data = webread('https://restcountries.com/v3.1/all');
data = webread('https://restcountries.com/v3.1/all');
app.Country_Select.Value = 'Niger';
if app.Country_Select.Value == 'Jordan'
app.SpokenLanguageEditField.Value = data{1,1}.languages;
elseif app.Country_Select.Value == 'Brazil'
app.SpokenLanguageEditField.Value = data{2,1}.languages;
else app.Country_Select.Value == 'Niger'
app.SpokenLanguageEditField.Value = data{9,1}.languages;
end
app.SpokenLanguageEditField.Value
采纳的回答
Voss
2023-7-17
Instead of using == to compare character vectors, use strcmp.
val = app.Country_Select.Value;
if strcmp(val,'Jordan')
idx = 1;
elseif strcmp(val,'Brazil')
idx = 2;
else
idx = 9;
end
app.SpokenLanguageEditField.Value = data{idx,1}.languages;
== compares element-by-element, i.e., character-by-character in this case since you're comparing character vectors, so the number of elements must be the same, i.e., the character vectors must be the same length. If the character vectors are not the same length, as in 'Niger' == 'Jordan', you'll get the error you got.
You could also use switch/case.
val = app.Country_Select.Value;
switch val
case 'Jordan'
idx = 1;
case 'Brazil'
idx = 2;
otherwise
idx = 9;
end
app.SpokenLanguageEditField.Value = data{idx,1}.languages;
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