How can I use splitapply() in matlab appdesigner?

Hi! :)

I have matlab 2018 and really dont want to upgrade to newer versions right now.

What I was wondering was whether anybody could show with an easy example how I can apply splitapply() to group my data in a 2 dimensional plot. Earlier I have seen a post regarding this issue but I didnt understand how to do that..

I have a heterogenous table osmotic data and I want to group my 2 d plot with the text data showing the bestsalts which is a colum containing two salts each row, like CaCl2 NaCl , ZnBr2 KCl

[Matt J]

If you provide some example data and the desired result, then perhaps.

Answer 1

[Cris LaPierre]

You could use a differnt function that incorporates grouping, like gscatter.

load carsmall
gscatter(Displacement,Horsepower,Model_Year)

To specifically use splitapply, create an anonymous function with your plotting command. Something like this (I'm specivically trying to duplicate gscatter here).

figure
hold on
[G,ID] = findgroups(Model_Year);
splitapply(@(x)plot(x(:,1),x(:,2),'.','MarkerSize',20),[Displacement,Horsepower],G)
legend(string(ID),'Location','best')

[Cris LaPierre]

Here's what the actual callback funciton might look like. I'm assuming the data to plot is a property of the app. See this page if you don't know what that means:

https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html

function ButtonPushed(app, event)
    hold(app.UIAxes,"on")
    [G,ID] = findgroups(app.Model_Year);
    splitapply(@(x)plot(app.UIAxes,x(:,1),x(:,2),'.','MarkerSize',20),[app.Displacement,app.Horsepower],G);
    legend(app.UIAxes,string(ID),'Location','best')
end