specifying the coordinates of the corners of astraight line segments

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Mads Albertsen
Mads Albertsen 2021-8-13
回答： DGM 2021-8-13
i have tried multiple different ways but always end up with errors, i need to make the following equation into a loop
The initial point is x0 = (0, 0)T and the initial direction is along a unit vector d0 = (1, 0)T .
the angel i get from a row vector consisting of alternating length and angle specifications [l1, φ1, l2, φ2, . . . ].
the l_n is always the same, but the angel changes, i split it up so i got 2 vectors, 1 with the length and 1 with the angels.
idk if it is enough information, in short, i want the equation to run the same number of times there is l_n in the vector.
if anymore information is needed let me know, and thanks in advance

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回答（1 个）

DGM
DGM 2021-8-13
Ran in:
Something like this?
pt0 = [0 0]; % initial position [x y]
segl = 1; % segment length
N = 10; % number of segments
% these are the polar component vectors
segments = ones(1,N)*segl;
angles = [0 45 90 45 -90 180 -135 -180 45 90];
% convert to rectangular deltas
pts = [segments.*cosd(angles); segments.*sind(angles)].';
% accumulate deltas
pts = cumsum([pt0; pts],1);
plot(pts(:,1),pts(:,2))
If the angles are relative, you could just do cumsum on the angle vector before converting.

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