I don't get an error message (after I correct the missing line break after
the comment
> b<- sapply(a, Cfun, upper=1)
> b
[1] 1.583458e-54 7.768026e-50 2.317562e-45 4.206260e-41 4.645737e-37
3.123801e-33 1.279358e-29 3.193257e-26 4.860876e-23
[10] 4.516582e-20 2.564400e-17 8.908932e-15 1.896996e-12 2.481084e-10
1.998561e-08 9.946570e-07 3.067751e-05 5.862075e-04
[19] 6.818952e-03 4.297061e-02 0.000000e+00 3.175122e-01 3.723022e-01
2.364930e-01 9.144836e-02 2.190878e-02 3.252754e-03
[28] 2.983763e-04 1.685692e-05 5.849602e-07 1.244158e-08 1.619155e-10
1.287603e-12 6.250149e-15 1.850281e-17 3.338241e-20
[37] 3.668412e-23 2.454192e-26 9.991546e-30 2.474577e-33 3.727226e-37
3.413319e-41 1.900112e-45 6.428505e-50 1.321588e-54
[46] 1.650722e-59 1.252524e-64 5.772750e-70 1.615916e-75 2.746972e-81
2.835655e-87 1.777399e-93 6.764271e-100 1.562923e-106
[55] 2.192373e-113 1.866955e-120 9.651205e-128 3.028623e-135 5.769185e-143
6.670835e-151 4.682023e-159 1.994643e-167 5.157808e-176
[64] 8.095084e-185 7.711162e-194 4.458042e-203 1.564139e-212 3.330362e-222
4.302974e-232 3.373500e-242 1.604721e-252 4.631224e-263
[73] 8.108474e-274 8.611898e-285 5.547745e-296 0.000000e+00 0.000000e+00
0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
[82] 0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
[91] 0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
0.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
[100] 0.000000e+00
-thomas
On Tue, Apr 9, 2013 at 3:14 PM, Janesh Devkota <janesh.devk...@gmail.com>wrote:
> I am trying to solve an integral in R. However, I am getting an error when
> I am trying to solve for that integral.
>
> The equation that I am trying to solve is as follows:
>
> $$ C_m = \frac{{abs{x}}e^{2x}}{\pi^{1/2}}\int_0^t t^{-3/2}e^{-x^2/t-t}dt $$
>
> [image: enter image description here]
>
> The code that I am using is as follows:
>
> a <- seq(from=-10, by=0.5,length=100)
> ## Create a function to compute integrationCfun <- function(XX, upper){
> integrand <- function(x)x^(-0.5)*exp((-XX^2/x)-x)
> integrated <- integrate(integrand, lower=0, upper=upper)$value
> (final <- abs(XX)*pi^(-0.5)*exp(2*XX)*integrated) }
>
>
> b<- sapply(a, Cfun, upper=1)
>
> The error that I am getting is as follows:
>
> Error in integrate(integrand, lower = 0, upper = upper) :
> the integral is probably divergent
>
> Does this mean I cannot solve the integral ?
>
> Any possible ways to fix this problem will be highly appreciated.The
> question can be found on
>
> http://stackoverflow.com/questions/15892586/solving-an-integral-in-r-gives-error-the-integral-is-probably-divergent
> also.
>
> Thanks.
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Thomas Lumley
Professor of Biostatistics
University of Auckland
[[alternative HTML version deleted]]
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and provide commented, minimal, self-contained, reproducible code.
