# Thread Subject: Vector build up help

 Subject: Vector build up help From: Aron Sceidt Date: 16 May, 2011 17:48:04 Message: 1 of 5 Is there an efficient way to build a vector like for example I need four 1's after each other, two 2's, seven 4's and three 9's? Something like the way we use the colon operator? [1 1 1 1 2 2 4 4 4 4 4 4 4 9 9 9]
 Subject: Vector build up help From: Andy Date: 16 May, 2011 17:57:19 Message: 2 of 5 "Aron Sceidt" wrote in message ... > Is there an efficient way to build a vector like for example I need four 1's after each other, two 2's, seven 4's and three 9's? Something like the way we use the colon operator? > > [1 1 1 1 2 2 4 4 4 4 4 4 4 9 9 9] Only if you can describe a consistent pattern by which you are building the vector. This seems sort of random.
 Subject: Vector build up help From: dpb Date: 16 May, 2011 17:57:35 Message: 3 of 5 On 5/16/2011 12:48 PM, Aron Sceidt wrote: > Is there an efficient way to build a vector like for example I need four > 1's after each other, two 2's, seven 4's and three 9's? Something like > the way we use the colon operator? > > [1 1 1 1 2 2 4 4 4 4 4 4 4 9 9 9] Combinations of repmat(), ones(), etc., can be joined in creative ways... :) There are other more exotic things that can be used on occasion depending on the actual pattern(s) needed; what, specifically would be dependent on those patterns. [ones(1,4) 2 2 4*ones(1,7) 9 9 9] is just one obvious of any number of possibilities for the example. One would presume the number of repetitions and values are programmatically know; if so, the above could be automated or at least made generic w/ use of variables instead of explicit constants. --
 Subject: Vector build up help From: Roger Stafford Date: 16 May, 2011 18:43:04 Message: 4 of 5 "Aron Sceidt" wrote in message ... > Is there an efficient way to build a vector like for example I need four 1's after each other, two 2's, seven 4's and three 9's? Something like the way we use the colon operator? > > [1 1 1 1 2 2 4 4 4 4 4 4 4 9 9 9] - - - - - - - - - - - - -  % Given these;  u = [1 2 4 9]; % The values to be repeated  c = [4 2 7 3]; % Repetition counts of each value  % Do this:  p = cumsum([1,c]);  v = zeros(1,p(end)-1);  v(p(1:end-1)) = diff([0,u]);  v = cumsum(v); Then x would be your desired result. Roger Stafford
 Subject: Vector build up help From: Roger Stafford Date: 16 May, 2011 19:00:05 Message: 5 of 5 "Roger Stafford" wrote in message ... > Then x would be your desired result. - - - - - - - - -   Correction: Then v would be your desired result. Roger Stafford

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