2D interpolation
in [Matlab]
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From: us on 2 Aug 2010 14:13 "Ganesh " <nganesh76(a)hotmail.com> wrote in message <i3715k$8p$1(a)fred.mathworks.com>... > B=interp2(A,1:0.1:65,1:0.1:53); > ??? Error using ==> interp2 at 147 > XI and YI must be the same size or vectors of different orientations. > > Thank you! > > "Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i37000$fda$1(a)fred.mathworks.com>... > > > > > > Call interp2 in 5-argument form, > > > > interp2(1:65, 1:53, Z, 1:0.2:65, 1:0.2:53) > Lets say my rectangular grid is called A of size(65,53) & type double. I am looking to make it into a larger matrix with separation 0.1cm instead of 0.5 cm and call this as matrix B. Can you help me in using the interp2 command now? What is Z in your command? I tried it but in vain. well... what about: A(?)... also note: you must enter your YIs as a col vec for this to work, eg, m=magic(3); r=interp2(1:3,1:3,m,1:.5:3,(1:.5:3).'); % <- note the transpose()... us
From: Ganesh on 2 Aug 2010 14:24 Thank you! It works well using this method, but only if you have a square matrix. To being with, I have a rectangular matrix. Any way to work around this restriction while using the interp2 command. Suppose A=matrix of size 65x53 with 0.5 cm separation between each grid point. All I want to do is create another matrix B with 0.1 cm separation between grid points. > well... > what about: A(?)... > > also note: you must enter your YIs as a col vec for this to work, eg, > > m=magic(3); > r=interp2(1:3,1:3,m,1:.5:3,(1:.5:3).'); % <- note the transpose()... > > us
From: us on 2 Aug 2010 14:31 "Ganesh " <nganesh76(a)hotmail.com> wrote in message <i372g5$o5g$1(a)fred.mathworks.com>... > Thank you! > It works well using this method, but only if you have a square matrix. To being with, I have a rectangular matrix. Any way to work around this restriction while using the interp2 command. > Suppose A=matrix of size 65x53 with 0.5 cm separation between each grid point. All I want to do is create another matrix B with 0.1 cm separation between grid points. > > > well... > > what about: A(?)... > > > > also note: you must enter your YIs as a col vec for this to work, eg, > > > > m=magic(3); > > r=interp2(1:3,1:3,m,1:.5:3,(1:.5:3).'); % <- note the transpose()... > > > > us sigh... m=[magic(3),2*magic(3)]; [nr,nc]=size(m); r=interp2(1:nc,1:nr,m,1:.5:nc,(1:.5:nr).'); % <- note the transpose()... us
From: Ganesh on 2 Aug 2010 14:56
Oh, I got the order of rows, columns reversed.. thanks for the help with code. It works! "us " <us(a)neurol.unizh.ch> wrote in message > > sigh... > > m=[magic(3),2*magic(3)]; > [nr,nc]=size(m); > r=interp2(1:nc,1:nr,m,1:.5:nc,(1:.5:nr).'); % <- note the transpose()... > > us |