Constraints on the linspace command

Hi all,

A while back I asked a question about getting a very simple path between two 3D Cartesian points (x,y,z) and one of the answers was using the linspace command which worked perfectly. My problem now requires a constraint on the z coordinate:

z >= 10

When I input the z >= 10 command nothing changes, i.e. the answer is still below 10. Can you apply these constraints to a linspace command or will I now have to find an alternative approach? x and y are still unconstrained and my problem is still finding a path between (x1,y1,z1) and (x2,y2,z2). The z >= 10 constraint is the only constraint on the path.

Thanks.

[Jan]

Please post a link to the question you are talking of and the relevant part of your code. Where do you "input the z >= 10" command?

[Walter Roberson]

Probably http://uk.mathworks.com/matlabcentral/answers/226455-finding-the-path-between-two-points

[John D'Errico]

Your question makes no sense at all.

If the start and end points of a path both satisfy z >= 10, then for a linear path, so must (and will) EVERY point in between.

Even if the path is allowed to be nonlinear, as long as it is continuous, it STILL must satisfy that condition at the endpoints. And if it does, then linspace is fine.

So what is the problem?!? You need to explain yourself far more clearly.

Answer 1

[Jan]

Based on James Tursa's answer:

Point1  = whatever;
Point30 = whatever;
Pmatrix = [linspace(Point1(1), Point30(1), 30); ...
           linspace(Point1(2), Point30(2), 30); ...
           max(10, linspace(Point1(3), Point30(3), 30))];

[Zena Assaad]

This worked well. Thank you.