a looping problem
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From: dale on 5 Aug 2010 15:54 Hi guys, I'm asking for some more help.I have a looping problem. My entire code is below. I want to basically return M = [ 2049.7202; 3357.3591]. I only seem to return one of these depending on if I use: % for i = 3:6 % for j = 10:11 OR % for i = 8:9 % for j = 7:11 THE CODE: %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% clc; clear all; M = zeros(1) exts = [ 3 10 6 11; 8 7 9 11] % ext is the extends of the region [ m n ] = size(exts) ; len = m; for i = exts(:,1): exts(:,3) for j = exts(:,2): exts(:,4) % for i = 3:6 % for j = 10:11 % for i = 8:9 % for j = 7:11 G= [ 0 0 0 0 0 0 0 0 0 0 0 0; 0 7.2111 17.2627 8.9443 10.7703 21.2603 3.1623 15.8114 1.4142 8.9443 7.2111 0; 0 11.4018 16.5529 134.6180 327.6126 417.4326 409.8902 393.2150 386.3315 306.7409 132.9662 0; 0 12.6491 5.8310 188.8597 323.3110 311.4643 398.8483 402.8399 396.3231 415.8654 317.5154 0; 0 16.4924 13.0384 130.2075 466.9047 341.5845 11.4018 22.8035 30.8869 384.8792 409.3531 0; 0 21.0238 12.6491 28.2843 422.1706 415.2036 6.3246 3.1623 16.1245 390.0051 415.0012 0; 0 27.8927 21.0238 17.2627 428.1682 410.1756 17.4929 7.6158 11.4018 391.1547 411.0304 0; 0 12.0000 30.8869 13.4164 342.8615 445.4773 401.0112 400.6045 414.0193 424.8670 326.4506 0; 0 6.3246 20.8806 11.3137 152.1184 324.5705 425.0012 421.2671 398.0050 318.2012 154.3826 0; 0 8.2462 8.6023 17.2047 17.0294 4.0000 24.2074 17.4929 13.0384 11.4018 9.0554 0; 0 5.0990 12.1655 4.2426 1.4142 11.3137 17.7200 11.4018 16.5529 8.2462 156.0833 0; 0 0 0 0 0 0 0 0 0 0 0 0]; L = [ 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 1 0; 0 0 0 0 0 0 0 0 0 0 1 0; 0 0 0 0 0 0 0 0 0 1 1 0; 0 0 0 0 0 0 0 0 0 1 1 0; 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 2 2 2 2 0 0; 0 0 0 0 0 0 2 2 2 2 2 0; 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0 0 0 0] for k = 1:len if (L(i,j) ==k) M = M + G(i,j); end end end end M %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% thanks dale
From: Walter Roberson on 5 Aug 2010 16:06 dale wrote: > exts = [ 3 10 6 11; > 8 7 9 11] % ext is the extends of the > region > for i = exts(:,1): exts(:,3) exts(:,1) would be a column with 2 values, as would be exts(:,3). When you use the colon operator (":") with multiple rows, it ignores all but the first row.
From: Andy on 5 Aug 2010 16:09 for i = exts(:,1): exts(:,3) for j = exts(:,2): exts(:,4) Should be: for i = exts(1,1): exts(1,3) for j = exts(1,2): exts(1,4)
From: dale on 5 Aug 2010 16:19 thanks andy , but it only returns the following: M = 2049.7202 I would like to get: M = 2049.7202 3357.3591 how can i do this? best, dale
From: Andy on 5 Aug 2010 16:29
"dale " <persad34(a)gmail.com> wrote in message <i3f6bp$ccs$1(a)fred.mathworks.com>... > thanks andy , but it only returns the following: > > M = > > 2049.7202 > > I would like to get: > > M = > > 2049.7202 > 3357.3591 > > how can i do this? > > best, > dale Well, look at your code. You simply overwrite M in every loop iteration, instead of storing a new value. |