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How to make a line of fixed length?

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Hi all,
I want to make a line that has a fixed length and it has a partciular direction. I would appreciate any suggestions for this. Thanks!
Davide Masiello
Davide Masiello on 29 Nov 2022
I am afraid you need to be clearer. By making, do you mean plotting?
Moreover, what do you mean with direction?
Mariam Shahab
Mariam Shahab on 29 Nov 2022
Yes, by making, I meant plotting. As for direction, I mean the orientation of the line (i.e. the slope of the line).

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Accepted Answer

Star Strider
Star Strider on 29 Nov 2022
It is relatively straightforward to write an anonymous function for this —
createLine = @(startpt, slope, len) [startpt(1) startpt(1)+len.*cos(atan(slope)); startpt(2) startpt(2)+len.*sin(atan(slope))];
slope = rand % Scalar
slope = 0.9275
startpoint = rand(1,2) % Two-Element Vector
startpoint = 1×2
0.2799 0.8866
long = 10*rand % Scalar
long = 7.5515
linevec = createLine(startpoint, slope, long)
linevec = 2×2
0.2799 5.8167 0.8866 6.0217
Check = [tan(atan2(diff(linevec(2,:)), diff(linevec(1,:)))) hypot(diff(linevec(2,:)),diff(linevec(1,:)))]
Check = 1×2
0.9275 7.5515
plot(linevec(1,:), linevec(2,:))
title(sprintf('Line from (%.2f, %.2f) to (%.2f, %.2f), slope %.2f, length %.2f', [linevec(:,1); linevec(:,2); slope; long]))
Experiment with the ‘createLine’ function.

More Answers (1)

Vilém Frynta
Vilém Frynta on 29 Nov 2022
You can specify length with numbers of your choice.
You can specify direction numerically as well, you just need to use your imagination and get creative.
x = [1 11];
y = [2 22];


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