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Geometrically spaced vector

30 Jan 2008 (Updated 16 Apr 2008)

Code covered by the BSD License

Create a geometrically spaced vector where each subsequent step is G times bigger than the previous

File Information

Description

Matlab supplies the functions linspace and logspace to generate vectors. This is a alternate/additional spacing algorithm to add to the list.

Geometric spacing in this case is defined as points spaced in such a way that each subsequent step is G times bigger than the previous one.

GEOSPACE(X1, X2) generates a row vector of 100 linearly equally spaced points between X1 and X2.

GEOSPACE(X1, X2, N) generates N linearly spaced points between X1 and X2. If N<2 then X2 is returned.

GEOSPACE(X1, X2, N, G) generates N points between X1 and X2 with a spacing defined by G. Each step is G times bigger than the previous step.

MATLAB release

MATLAB 7.4 (R2007a)

Comments and Ratings (3)
30 Jan 2008	Dimitri Shvorob	Supplied three inputs, the function (for some reason) replicates LINSPACE. Supplied four inputs.. how can one set both N and G? In any case, the task is a two-liner: function[x] = geospace(x1,x2,n) k = (x2/x1)^(1/(n-1)); x = k.^(0:(n-1))*x1;
30 Jan 2008	Gus Brown	Actually the code you submitted does not replicate the functionality of geospace. And yes it is a two-liner but I find it useful, I'm sorry you don't. You can specify N and G as the help suggests by using the following form GEOSPACE(X1, X2, N, G) Note: G specifies the growth in spacing and not the initial spacing. When you specify two inputs the default spacing growth G is 1, i.e. the same as linspace. Please read the help file.
22 Dec 2009	Matt Fig	Works as advertised.

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Updates
07 Feb 2008	Changed the summary wording to fit the 100 character limit.
11 Feb 2008	Added an example to the help.
16 Apr 2008	Description change

Tag Activity for this File
Tag	Applied By	Date/Time
spacing vector geometric	Gus Brown	22 Oct 2008 09:45:33