Displaying 2 results from an estimated 2 matches for "dblquad".
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biquad
2012 Jan 27
3
Numerical instability in new R Windows development version
I have a question concerning the new Windows toolchain for R >= 2.14.2.
When trying out my package 'pracma' on the win-builder development version
it will stop with the following error message:
> f3 <- function(x, y) sqrt((1 - (x^2 + y^2)) * (x^2 + y^2 <= 1))
> dblquad(f3, -1, 1, -1, 1) # 2.094395124 , i.e. 2/3*pi , err = 2e-8
Warning in sqrt((1 - (x^2 + y^2)) * (x^2 + y^2 <= 1)) : NaNs produced
Warning in sqrt((1 - (x^2 + y^2)) * (x^2 + y^2 <= 1)) : NaNs produced
Error in integrate(function(y) f(x, y), ya, yb, subdivisions = subdivs, :
non...
2013 Feb 16
3
two dimensional integration
Dear R-users,
I'm wondering how to calculate this double integral in R:
int_a^b int_c^y g(x, y) dx dy
where g(x,y) = exp(- alpha (y - x)) * b
Thanks for answering!
Cheers,
Alui
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