Plot function in app designer error "Not enough input arguments."

Hello every one,

I'm working on a little project where the main goal is to read a big excel file (xlsx) and extract information which interest me.

I need to make table and plot some value from this excel.

I import the excel file with the function readtable. However, when i want to plot with the data in the table, i have the following error :

Error using plot

Not enough input arguments.

Error in app2/ButtonPushed (line 53)

plot(app.UIAxes,x,y);

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 335)

Error while evaluating Button PrivateButtonPushedFcn.

Thank you and i hope someone will help me !

Answer 1

[Arthur Roué]

x and y are structures, you need to select the correct field. For instance :

plot(app.UIAXes, x.freq_MHZ, i.iLdB)

[Karol Szczech]

Well actually, i made a mistake, th real code is the following one :

i use the function "table2array" and not "table2struct".

If i let the same code, i still have the error "Error using plot Not enough input arguments"

[Karol Szczech]

Which is weird, because i put the good amount of input arguments.

[Arthur Roué]

Indeed it's kinda weird.

Can you share the content of app.UIAxes, x and y ?

[Karol Szczech]

Hey,

here's the code

Maybe i can change the XTick for an {} and not a [] ?

[Arthur Roué]

Ok for UIAxes definition, can you add a breakpoint at your plot line and evaluate variable app.UIAxes, x and y ?

[Karol Szczech]

Yeah, i made a breakpoint on the plot and have this message :

[Karol Szczech]

I assume that app designer don't want to plot the x and y because it's an array.

[Arthur Roué]

Can you set the breakpoint before throwing the error ? I wanted to know the content of app.UIAxes, x and y before evaluation. Or better, can you share your app with the xlsxa data file ?

[Karol Szczech]

Yeah, i think it's better if i share the project. It's the first time i have this error and i'm a little lost.

[Karol Szczech]

And thank you for your time

[Arthur Roué]

Your problem is that x and y are cell-str because you use a table, plot function only take numerical arrays as input. If you load your data with readmatrix instead of readtable, it would be ok.

Now, if you want to keep a table object, you need to process a bit your x and y data before plotting

t = readtable('graphTest2_clean2.xlsx', 'Sheet', 1);
%ab = table2array(t);
app.UITable .Data = t; % associe le tableau excel à la var t 
t.Properties.VariableNames{1} = 'freq_MHz';
t.Properties.VariableNames{2} = 'iLdB';
t.Properties.VariableNames{3} = 'pair12';
t.Properties.VariableNames{4} = 'pair34';
t.Properties.VariableNames{5} = 'NextdB';
t.Properties.VariableNames{6} = 'NextPair1236';
t.Properties.VariableNames{7} = 'RLdBLimit';
t.Properties.VariableNames{8} = 'RLpair12';
t.Properties.VariableNames{9} = 'RLPair36';
app.UITable.ColumnName = t.Properties.VariableNames ;
%x = ab(5:45,1); 
            
% Get columns of table t            
x = t.freq_MHz;
y = t.iLdB;
            
% There are empty values at the end of y. They are replaced by
% 'NaN' beforr numerical conversion
y(cellfun(@isempty, y)) = {'NaN'};
            
% Convert x and from cell-str to numerical array
x = cellfun(@str2num, x);
y = cellfun(@str2num, y);
            
% Plot
plot(app.UIAxes, x, y);

[Karol Szczech]

Thank you very much ! I understand now ! Have a nice day !

[Arthur Roué]

Y a pas de quoi, tu peux maintenant fermer la question et/ou accepter la réponse !

Bonne journée ;)