# area, stairs

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Hamed Amini on 20 Jul 2011
Edited: Bill Tubbs on 30 Mar 2024
Is there any property setting for 'area' function which generates the 'straits' for the boundary of the colored regions instead of 'plot' curves?

Oleg Komarov on 20 Jul 2011
% Random row input
x = 1:10;
y = rand(1,10);
% Normal area chart
subplot(3,1,1)
area(x,y)
% Stairs chart (non area)
subplot(3,1,2)
stairs(x,y)
% Stairs area
subplot(3,1,3)
x = [x;x];
y = [y;y];
area(x([2:end end]),y(1:end))
Hamed Amini on 20 Jul 2011
Very Clever! Thanks Oleg.

Bill Tubbs on 30 Mar 2024
Edited: Bill Tubbs on 30 Mar 2024
Building on Oleg's answer I wrote a function for doing the same thing with a stacked area plot. However, the data in the x and Y arguments here are aligned vertically in the rows, not horizontally in the columns.
function area_step_plot(x, Y)
assert(size(x, 2) == 1)
nx = size(x, 1);
Y = Y(1:nx-1, :); % final y-values are not used
ny = size(Y, 2);
X = [x x]';
X2 = X(2:end-1)';
Y2 = reshape(permute(cat(3, Y, Y), [3 1 2]), [], ny);
area(X2, Y2)
end
The Y argument can be a matrix of column vectors containing different data series.
x = (1:10)';
Y = rand(10, 3); % Note: last row is not plotted
area_step_plot(x, Y)