Plot all polyshapes in cell array

10 views (last 30 days)
Hello,
I am learing Matlab and I would like to plot all polyshapes stored in a cell array (D) but avoiding for...end loop.
Each cell contains a 2d vector with each vertex coordinates.
So far I only know to plot it like this
for i=size(D,1)
plot(D{i}(:,2), D{i}(:,1));
end
Is there any more concise way to achieve it with a single instruction not using a for...end loop?
Thanks

Accepted Answer

Voss
Voss on 7 May 2022
You could use cellfun:
cellfun(@(x)plot(x(:,1),x(:,2)),D);
That's more concise, I guess, but it also may be less clear than the loop you already have. And it's not likely to be much different performance-wise.
[In general, cellfun(f,C) runs the function f on each cell of cell array C. In this case, the function is the anonymous function
@(x)plot(x(:,1),x(:,2))
and the cell array is D.]
  2 Comments
Luis Rosety
Luis Rosety on 8 May 2022
Edited: Luis Rosety on 8 May 2022
Thanks!
This is what I was looking for: A single command.

Sign in to comment.

More Answers (1)

Steven Lord
Steven Lord on 8 May 2022
If you've already created them in a cell array you can simply turn that cell array into an array of polyshape objects and plot that array. Or you could start with a polyshape array initially, filling it in as you go.
C = cell(1, 10);
A1 = repmat(polyshape, 1, 10);
for k = 1:10
N = nsidedpoly(1000, 'Center', [2*k 0], 'Radius', 0.75);
C{k} = N; % Create a cell
A1(k) = N; % Fill in an array
end
A = [C{:}]
A =
1×10 polyshape array with properties: Vertices NumRegions NumHoles
plot(A)
axis equal
grid on
A1
A1 =
1×10 polyshape array with properties: Vertices NumRegions NumHoles
figure
plot(A1)
axis equal
grid on
  2 Comments
Luis Rosety
Luis Rosety on 8 May 2022
This doesn't work in my case.
It throws an error:
Error using horzcat
Dimensions of arrays being concatenated are not consistent.
Steven Lord
Steven Lord on 8 May 2022
Ah, I went off the subject of the message. You don't actually have polyshape objects in a cell array, you have coordinate data in the cell array. In that case, a skeleton for the approach I'd use:
% C is the cell array of coordinate data
P = repmat(polyshape, size(C)); % One polyshape per cell in C
for k = 1:numel(C)
data = C{k};
P(k) = polyshape(data(:, 2), data(:, 1));
end
plot(P)
I'm assuming the data in the cell array matches the requirements the polyshape function has for its inputs.

Sign in to comment.

Categories

Find more on Elementary Polygons in Help Center and File Exchange

Products


Release

R2022a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!