How can I plot the first 2 columns from a .csv file when the user selects an option from a pop menu

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Gemma Malagón 2019-8-9

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https://ww2.mathworks.cn/matlabcentral/answers/475577-how-can-i-plot-the-first-2-columns-from-a-csv-file-when-the-user-selects-an-option-from-a-pop-menu

评论： Gemma Malagón 2019-8-12

This is the code I have, what is the next step to callback the 'option 1' at the pop menu? and that it plots the 2 first colums?

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% 
handles.fileName=uigetfile({'*.csv;';'*.mat';'*.*'},...
                          'File Selector');
                      C = strsplit(handles.fileName,'.');

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Answer 1

Maadhav Akula 2019-8-12

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https://ww2.mathworks.cn/matlabcentral/answers/475577-how-can-i-plot-the-first-2-columns-from-a-csv-file-when-the-user-selects-an-option-from-a-pop-menu#answer_387248

在 MATLAB Online 中打开

Use the readmatrix function rather than strsplit. This may help you :-

% --- Executes on button press in pushbutton1. 
function pushbutton1_Callback(hObject, eventdata, handles) 
% hObject    handle to pushbutton1 (see GCBO) 
% eventdata  reserved - to be defined in a future version of MATLAB 
% handles    structure with handles and user data (see GUIDATA) 
handles.fileName=uigetfile({'*.csv;';'*.mat';'*.*'},... 
                          'File Selector'); 
guidata(hObject, handles);%This updates the handles structure 

Now at the popupmenu1_Callback: -

% --- Executes on selection change in popupmenu1. 
function popupmenu1_Callback(hObject, eventdata, handles) 
% hObject    handle to popupmenu1 (see GCBO) 
% eventdata  reserved - to be defined in a future version of MATLAB 
% handles    structure with handles and user data (see GUIDATA) 
contents = cellstr(get(hObject,'String'));%Gets the cell string of popupmenu 
pop_choice = contents{get(hObject,'Value')}; 
if(strcmp(pop_choice,'option 1'))%Checking for option 1 
    array = readmatrix(handles.fileName);%Reading the csv file 
    col1 = array(:, 1);%Values of Column 1 
    col2 = array(:, 2);%Values of Column 2 
    plot(col1,col2);%Plotting Column 1 vs Column 2 
end

You can refer the following link to know more about readmatrix: -

https://in.mathworks.com/help/matlab/ref/readmatrix.html

Hope this helps!

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Gemma Malagón 2019-8-12

Yes, thank you very mkuch. What I want to do is after I select one option of the pop menu (10 options in total) and then I press the load button to load a .csv file a graph plots the first 2 columns if I select the 1st option of the menu. Then if I select option 2 I want it to plot columns 9 and 10, then fro option 3 I want it to plot columns 17 and 18, and so on for the rest of the options of the popmenu.

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