MATLAB: What is the problem with the function

area

function [area , cr ]= circle(r) area = pi* (r^2) ; cr = pi * r * 2 ;

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Formatting.

function [area, cr] = circle(r)
area = pi*(r^2);
cr = pi*r*2;
end

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MATLAB: Plot to avoid certain regions in 2D plot

Read about inpolygon

x = 350.5; y = 350.5; r = 50;
th = 0:pi/50:2*pi;
xunit = r * cos(th) + x;
yunit = r * sin(th) + y;
poly0 = polyshape(xunit(1:end-1),yunit(1:end-1));
plot(poly0);
hold on;
poly1 = polyshape([100 100 200 200],[100 200 200 100]); %square
plot(poly1);
hold on
loc = randi([1,500],50, 2);
% avoid poly0
idx = inpolygon(loc(:,1),loc(:,2),poly0.Vertices(:,1),poly0.Vertices(:,2)) ;
loc(idx,:) = NaN ;
% avoid poly1
idx = inpolygon(loc(:,1),loc(:,2),poly1.Vertices(:,1),poly1.Vertices(:,2)) ;
loc(idx,:) = NaN ;
plot(loc(:,1),loc(:,2),'.r')

MATLAB: What the right function

If checkered is supposed to be a nested function if must be closed with the keyword end.

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MATLAB: Plot to avoid certain regions in 2D plot

MATLAB: What the right function

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