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From: Edwin on 13 Jul 2010 05:39
hello everyone,
I'm getting error in interp1 when trying to use it with the matrix M
eventhough the values are indeed distinct which is the error interp1 is claiming about
or am I doing something wrong?, any help?.

yi = interp1(M(1:22,2),M(1:22,1),0.0021);

M=[9.00000000000000e-06,0.0794328234724282;
9.00000000000000e05,0.0794327830080303;
0.000200000000000000,0.0794158580930622;
0.000500000000000000,0.0775021947253288;
0.000800000000000000,0.0700716753229793;
0.000900000000000000,0.0666367450356137;
0.00100000000000000,0.0629529444660376;
0.00200000000000000,0.0296328610742864;
0.00300000000000000,0.0129529572779240;
0.00400000000000000,0.00588405521525375;
0.00500000000000000,0.00282225993949341;
0.0100000000000000,0.000139202681380924;
0.0200000000000000,2.10439055553126e06;
0.0300000000000000,1.00790214263658e07;
0.0400000000000000,8.87793765390535e09;
0.0500000000000000,1.14977298231698e09;
0.100000000000000,8.11209646405325e13;
0.200000000000000,1.41302738508455e16;
0.300000000000000,2.55098370081839e19;
0.400000000000000,0;0.500000000000000,0;
1,0;]

Thanks in advance
From: Cris Luengo on 13 Jul 2010 06:00
"Edwin " <onest30(a)gmail.com> wrote in message <i1hc7n$b1f$1(a)fred.mathworks.com>...
> hello everyone,
> I'm getting error in interp1 when trying to use it with the matrix M
> eventhough the values are indeed distinct which is the error interp1 is claiming about
> or am I doing something wrong?, any help?.
>
> yi = interp1(M(1:22,2),M(1:22,1),0.0021);
>
> M=[9.00000000000000e-06,0.0794328234724282;
> 9.00000000000000e05,0.0794327830080303;
> 0.000200000000000000,0.0794158580930622;
> 0.000500000000000000,0.0775021947253288;
> 0.000800000000000000,0.0700716753229793;
> 0.000900000000000000,0.0666367450356137;
> 0.00100000000000000,0.0629529444660376;
> 0.00200000000000000,0.0296328610742864;
> 0.00300000000000000,0.0129529572779240;
> 0.00400000000000000,0.00588405521525375;
> 0.00500000000000000,0.00282225993949341;
> 0.0100000000000000,0.000139202681380924;
> 0.0200000000000000,2.10439055553126e06;
> 0.0300000000000000,1.00790214263658e07;
> 0.0400000000000000,8.87793765390535e09;
> 0.0500000000000000,1.14977298231698e09;
> 0.100000000000000,8.11209646405325e13;
> 0.200000000000000,1.41302738508455e16;
> 0.300000000000000,2.55098370081839e19;
> 0.400000000000000,0;0.500000000000000,0;
> 1,0;]
>
> Thanks in advance

M(21,2) and M(22,2) are both == 0, so the values of X are not distinct.

Maybe you intend to do
yi = interp1(M(1:22,1),M(1:22,2),0.0021);
?

Also, M(1:22,1) is the same as M(:,1) in this case, but easier to read and won't break when you change the length of your array M.

Cheers,
Cris.
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