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maryam
Posts:
17
Registered:
12/25/12


Re: interpolate
Posted:
Dec 26, 2012 8:45 PM


dpb <none@non.net> wrote in message <kbg5ol$ugl$1@speranza.aioe.org>... > On 12/26/2012 5:03 PM, maryam wrote: > > dpb <none@non.net> wrote in message <kbfhar$1lo$1@speranza.aioe.org>... > >> On 12/26/2012 12:29 PM, maryam wrote: > >> ... > >> > how could I interpolate rows of a matrix so that original value of rows > >> > don't change? > >> > >> Didn't we do this before the holidays????? > >> > >> doc interp1 > >> > >> >> X = 0:10; V = sin(X); Xq = 0:.25:10; > >> >> Vq = interp1(X,V,Xq); > >> >> all(Vq(Xq==fix(Xq))==V) > >> ans = > >> 1 > >> >> > >> > >> > >> What else do you need???? > >  > > This question has already been answered? > > I searched but I didn't find it > > thank you very much for your answer but I mean we have a matrix nbym: > > assume M= [a b c;d e f; g h i] > > I want to interpolate its rows so that is equal to > > M=[a a+d a+2d a+3d ... 7d b b+d ... b+7d c... c+7d ; d... d+7d... f+7d ; > > g ... i+7d] > > Can you explain me how I could do it? > > I'm virtually certain you asked this same question some days ago and I > told you then the same thing... > > Use interp1() as the above example w/ an interpolating vector of the > points at which you want interpolants. Here's why I think I remember > the question and the response, as I pointed out then, since interp1() > works on columns you'll need to transpose, interpolate, then transpose back. > > I can't interpret the above [a a+d a+2d ... ) precisely but assuming d > here is a different 'd' than that of the value in the original M(2,1) > and is just a delta then the interpolant would seem to be > linspace(0,N*d,N+1) where N is the number of intervals (7 above) added > to a, b, c, ..., etc. > >   Dear dpb thank you so much, I'm Beginner in matlab, I apologize for my request Is it possible give me matlab code of my question? I couldn't use 'for' command or M(:,columns) ... my matrix is 1000by1200 d=delta=1/16 its values (arrays) is arbitrary here thanks for your help



