Effacer les filtres
Effacer les filtres

Dot indexing is not supported for variables of this type.

25 vues (au cours des 30 derniers jours)
Yunus Emre
Yunus Emre le 25 Mai 2024 à 12:10
Commenté : Image Analyst le 25 Mai 2024 à 20:03
Dot indexing is not supported for variables of this type.
Error in fetchFiveDayForecast (line 18)
dt(i) = datetime(list(i).dt_txt, 'InputFormat', 'yyyy-MM-dd HH:mm:ss', 'Format', 'yyyy-MM-dd HH:mm:ss', 'TimeZone', 'UTC');
Error in app2/updateWeatherData (line 27)
weatherData = fetchFiveDayForecast(selectedCity, app.apiKey);
Error in app2/GetInfoButtonPushed (line 62)
app.updateWeatherData();
Error in matlab.apps.AppBase>@(source,event)executeCallback(ams,app,callback,requiresEventData,event) (line 62)
newCallback = @(source, event)executeCallback(ams, ...
Error while evaluating Button PrivateButtonPushedFcn.
Those are the error I got.
function weatherData = fetchFiveDayForecast(city,apiKey)
baseUrl = 'https://api.openweathermap.org/data/2.5/forecast';
url = sprintf('%s?q=%s&appid=%s&units=metric', baseUrl, city, apiKey);
response = webread(url);
% Process JSON data
list = response.list;
% Preallocate arrays for efficiency
numEntries = length(list);
dt = datetime.empty(numEntries, 0);
temp = zeros(numEntries, 1);
humidity = zeros(numEntries, 1);
windSpeed = zeros(numEntries, 1);
% Loop through each entry in the list and extract data
for i = 1:numEntries
dt(i) = datetime(list(i).dt_txt, 'InputFormat', 'yyyy-MM-dd HH:mm:ss', 'Format', 'yyyy-MM-dd HH:mm:ss', 'TimeZone', 'UTC');
temp(i) = list(i).main.temp;
humidity(i) = list(i).main.humidity;
windSpeed(i) = list(i).wind.speed;
end
% Store the data in the output structure
weatherData.dt = dt;
weatherData.temp = temp;
weatherData.humidity = humidity;
weatherData.windSpeed = windSpeed;
end
properties (Access = private)
apiKey = '8837203c2a21882aa541f6d408e564ab'; % Gerçek API anahtarınız ile değiştirin
cities = {'Adana' , 'Ankara' , 'İstanbul' , 'Antalya'}; % Şehirler için boş bir hücre dizisi başlatın
end
methods (Access = private)
function updateWeatherData(app,~)
selectedCity = app.CityDropDown.Value;
weatherData = fetchFiveDayForecast(selectedCity, app.apiKey);
% Update Temperature Plot
plot(app.UIAxes, weatherData.dt, weatherData.temp, '-o');
app.UIAxes.Title.String = 'Temperature (°C)';
% Update Humidity Plot
plot(app.UIAxes2, weatherData.dt, weatherData.humidity, '-o');
app.UIAxes2.Title.String = 'Humidity (%)';
% Update Wind Speed Plot
plot(app.UIAxes3, weatherData.dt, weatherData.windSpeed, '-o');
app.UIAxes3.Title.String = 'Wind Speed (m/s)';
end
function addCity(app)
newCity = app.CityEditField.Value;
if ~any(strcmp(app.cities, newCity))
app.cities{end+1} = newCity;
app.CityDropDown.Items = app.cities;
end
end
end
function AddCityButtonPushed(app, event)
app.addCity();
end
function GetInfoButtonPushed(app, event)
app.updateWeatherData();
end

Réponse acceptée

Torsten
Torsten le 25 Mai 2024 à 12:16
Déplacé(e) : Torsten le 25 Mai 2024 à 12:17
Test before your loop
% Loop through each entry in the list and extract data
for i = 1:numEntries
dt(i) = datetime(list(i).dt_txt, 'InputFormat', 'yyyy-MM-dd HH:mm:ss', 'Format', 'yyyy-MM-dd HH:mm:ss', 'TimeZone', 'UTC');
temp(i) = list(i).main.temp;
humidity(i) = list(i).main.humidity;
windSpeed(i) = list(i).wind.speed;
end
what you get when you try to access
list(1).dt_txt
list(1).main.temp
list(1).main.humidity
list(1).wind.speed
I doubt that dot indexing is allowed for "list".
  1 commentaire
Image Analyst
Image Analyst le 25 Mai 2024 à 20:03
After youi create list, do this
% Process JSON data
list = response.list % No semicolon
whos list % Display info about list.

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