Elements of an Array in For Loop
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From: Anamika on 3 Jun 2010 19:37 Hello, How do you refer to the elements of an array that you load in a for loop? In the code below, for the subplot section how can the variable be set so that it changes every time from X1 to X2 and so on until the loop gets over. Thanks for your input! ~Mika % Data file containing coordinates to be plotted load MyDataSet.dat % Loaded data gets assigned X1 = MyDataSet(1:616,2); Y1 = MyDataSet(1:616, 3); X2 = MyDataSet(617:1131,2); Y2 = MyDataSet(617:1131, 3); X3 = MyDataSet(1132:1655,2); Y3 = MyDataSet(1132:1655, 3); X4 = MyDataSet(1656:2050,2); Y4 = MyDataSet(1656:2050, 3); ..... ..... ..... X20 = MyDataSet(6661:6900,2); Y20 = MyDataSet(6661:6900, 3); % Sublot routine for n=1:20 h(n)=subplot(20,1,n); plot(X1,Y1, 'r'); % HOW TO REFER ARRAY ELEMENTS HERE? hold on; end
From: us on 3 Jun 2010 20:11 "Anamika " <Anamika.Darwin(a)gmail.com> wrote in message <hu9eeq$9p8$1(a)fred.mathworks.com>... > Hello, > > How do you refer to the elements of an array that you load in a for loop? > > In the code below, for the subplot section how can the variable be set so that it changes every time from X1 to X2 and so on until the loop gets over. > > Thanks for your input! > ~Mika > > % Data file containing coordinates to be plotted > > load MyDataSet.dat > > % Loaded data gets assigned > > X1 = MyDataSet(1:616,2); Y1 = MyDataSet(1:616, 3); > X2 = MyDataSet(617:1131,2); Y2 = MyDataSet(617:1131, 3); > X3 = MyDataSet(1132:1655,2); Y3 = MyDataSet(1132:1655, 3); > X4 = MyDataSet(1656:2050,2); Y4 = MyDataSet(1656:2050, 3); > .... > .... > .... > X20 = MyDataSet(6661:6900,2); Y20 = MyDataSet(6661:6900, 3); > > % Sublot routine > for n=1:20 > h(n)=subplot(20,1,n); > plot(X1,Y1, 'r'); % HOW TO REFER ARRAY ELEMENTS HERE? > hold on; > end this is heart-breaking terrible... http://matlabwiki.mathworks.com/MATLAB_FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F us
From: us on 3 Jun 2010 20:13 "Anamika " <Anamika.Darwin(a)gmail.com> wrote in message <hu9eb2$2di$1(a)fred.mathworks.com>... > Hello, > > How do you refer to the elements of an array that you load in a for loop? > > In the code below, for the subplot section how can the variable be set so that it changes every time from X1 to X2 and so on until the loop gets over. > > Thanks for your input! > ~Mika > > % Data file containing coordinates to be plotted > > load MyDataSet.dat > > % Loaded data gets assigned > > X1 = MyDataSet(1:616,2); Y1 = MyDataSet(1:616, 3); > X2 = MyDataSet(617:1131,2); Y2 = MyDataSet(617:1131, 3); > X3 = MyDataSet(1132:1655,2); Y3 = MyDataSet(1132:1655, 3); > X4 = MyDataSet(1656:2050,2); Y4 = MyDataSet(1656:2050, 3); > .... > .... > .... > X20 = MyDataSet(6661:6900,2); Y20 = MyDataSet(6661:6900, 3); > > % Sublot routine > for n=1:20 > h(n)=subplot(20,1,n); > plot(X1,Y1, 'r'); % HOW TO REFER ARRAY ELEMENTS HERE? > hold on; > end don't dup OPs(!)... the answer's here at http://www.mathworks.com/matlabcentral/newsreader/view_thread/283836 us
From: dpb on 3 Jun 2010 20:12 Anamika wrote: > Hello, > > How do you refer to the elements of an array that you load in a for loop? W/ subscripts such as for idx = 1:length(x) % assume x is vector z = abs(x(idx)); % do something w/ an element of x end > In the code below, for the subplot section how can the variable be set > so that it changes every time from X1 to X2 and so on until the loop > gets over. .... > load MyDataSet.dat > > % Loaded data gets assigned > X1 = MyDataSet(1:616,2); Y1 = MyDataSet(1:616, 3); > X2 = MyDataSet(617:1131,2); Y2 = MyDataSet(617:1131, 3); > X3 = MyDataSet(1132:1655,2); Y3 = MyDataSet(1132:1655, 3); > X4 = MyDataSet(1656:2050,2); Y4 = MyDataSet(1656:2050, 3); > .... > .... > .... > X20 = MyDataSet(6661:6900,2); Y20 = MyDataSet(6661:6900, 3); > > % Sublot routine > for n=1:20 > h(n)=subplot(20,1,n); > plot(X1,Y1, 'r'); % HOW TO REFER ARRAY ELEMENTS HERE? > hold on; > end I'd do something like (assuming you can't compute the breakpoints desired but need them specified as such and I don't see a pattern there otomh)... x = mydataset; % Shorten var name just for demo/less typing... blks = [615, 515, 524, ...]; % blocksize for each segment to plot i1 = 1; % first point for idx=1:length(blks) h(idx)=subplot(20,1,idx); % probably find this too many, but... i2 = i1+blks(idx); % end point this block plot(x(i1:i2,2),x(i1:i2,3)); x1 = x2+1; % 1st next block one past end this one end --
From: Anamika on 3 Jun 2010 20:47 Thanks dpb. The breakpoints are entirely dependent on a each data set I deal with. Just one question, for the last line, I think you meant to re-initialize i1 and not x1 (typo?). When I changed and applied, I got plot I want. Thanks, Mika > > I'd do something like (assuming you can't compute the breakpoints > desired but need them specified as such and I don't see a pattern there > otomh)... > > x = mydataset; % Shorten var name just for demo/less typing... > blks = [615, 515, 524, ...]; % blocksize for each segment to plot > i1 = 1; % first point > for idx=1:length(blks) > h(idx)=subplot(20,1,idx); % probably find this too many, but... > i2 = i1+blks(idx); % end point this block > plot(x(i1:i2,2),x(i1:i2,3)); > x1 = x2+1; % 1st next block one past end this one > end > > --
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