Write a GUI function that creates four random points. Radio buttons are used to choose the order of a polynomial to fit through the points. The points are plotted along with the chosen curve

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buttonGUI.m

function buttonGUI

f = figure('Visible', 'off','Position',...

 [360, 500, 400,400]);

grouph = uibuttongroup('Parent',f,'Units','Normalized',...

 'Position',[.3 .6 .4 .3], 'Title','Choose Order',...

 'SelectionChangeFcn',@whattodo);

but1 = uicontrol(grouph,'Style','radiobutton',...

 'String','First','Units','Normalized',...

 'Position', [.2 .8 .4 .2]);

but2 = uicontrol(grouph, 'Style','radiobutton',...

 'String','Second','Units','Normalized',...

 'Position',[.2 .5 .4 .2]);

but3 = uicontrol(grouph, 'Style','radiobutton',...

 'String','Third','Units','Normalized',...

 'Position',[.2 .2 .4 .2]);

axhan = axes('Units','Normalized','Position',...

 [.2,.2,.7,.3]);

x = 1:4;

y = randi(10, [1,4]);

lotx = 1: 0.2: 4;

set(grouph,'SelectedObject',[]) 

set(f,'Name','Exam GUI')

movegui(f,'center')

set(f,'Visible','on');

 function whattodo(source, eventdata)

which = get(grouph,'SelectedObject');

 if which == but1

 coefs = polyfit(x,y,1);

 elseif which == but2

 coefs = polyfit(x,y,2);

 else

 coefs = polyfit(x,y,3);

 end

 curve = polyval(coefs,lotx);

 

 plot(x,y,'ro',lotx,curve)

 end

end

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