search for: v_2

Displaying 8 results from an estimated 8 matches for "v_2".

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2020 Jun 24
2
Loop vectorization and unsafe floating point math
...uot;. But given this example (see also https://godbolt.org/z/fzRHsp ) //------------------------------------------------------------------ // // clang -O3 -Rpass=loop-vectorize -Rpass-analysis=loop-vectorize #include <stdio.h> #include <stdint.h> double v_1 = -902.30847021; double v_2 = -902.30847021; int main() { #pragma clang loop vectorize_width(2) unroll(disable) for (int i = 0; i < 16; ++i) { v_1 = v_1 * 430.33975544; } #pragma clang loop unroll(disable) for (int i = 0; i < 16; ++i) { v_2 = v_2 * 430.33975544; } printf("v_1: %f\n",...
2004 May 07
1
plotting planes and lines in wireframe()
...lation.... Hmm... Somewhat related, I would also like to plot a line in 3 d space... Finally, if you are feeling really brave, I am interested in doing all of this based on sums generating vectors (I know there is a linear algebra term for this) -- ie generate the plane based on c_1*v_1 + c_2*v_2 for c_1 and c_2 in reals. Thanks again to all you helpful folks! W
2006 Jun 30
1
lme and SAS Proc mixed
...ds nested within each refseqid, and 16 probenos nested within each of the probeids. I have specified in the SAS Proc Mixed procedure that the variance-covariance structure is to be compound symmetric. Therefore, the variance-covariance matrix is a block diagonal matrix of the form, V_1 0 0 0 V_2 0 0 0 V3 where each V_i represents a RefSeqID. Moreover, for each V_i the structure within the block is v_{11} v{12} v_{21} v{22} where v_{11} and v_{22} are different probeids nested within the refseqid, and so are correlated. The structure of both v_{11} and v_{22} are compound symm...
2006 Jun 30
0
SAS Proc Mixed and lme
...ds nested within each refseqid, and 16 probenos nested within each of the probeids. I have specified in the SAS Proc Mixed procedure that the variance-covariance structure is to be compound symmetric. Therefore, the variance-covariance matrix is a block diagonal matrix of the form, V_1 0 0 0 V_2 0 0 0 V3 where each V_i represents a RefSeqID. Moreover, for each V_i the structure within the block is v_{11} v{12} v_{21} v{22} where v_{11} and v_{22} are different probeids nested within the refseqid, and so are correlated. The structure of both v_{11} and v_{22} are compound symme...
2010 Oct 01
1
Question about Reduce
Hello! In the example below the Reduce() function by default assigns "a" to be the last accumulated value and "b" to be the current value in "x". I could not find this documented anywhere as the default settings for the Reduce() function. Does any sort of documentation for this behavior exist? x <- c(0,0,0,0,0,1,0,0,0,5,0,0,0,7,0,0,0,8,5,10)
2009 Aug 13
1
metafor random effects meta-analysis
Hello, Great to see the new metafor package for meta-analysis. I would like to perform a meta-analysis in which I initially calculate the intercept of the model with a nested random-effects structure. In lme, this would be model<- lme(v3~1, random=~1|species/study, weights = varFixed(~Wt), method = "REML") where multiple effects sizes are measured for some studies and more than
2009 Mar 19
8
function question
Dear R Gurus: I read somewhere that functions are considered vectors. Is this true, please? thanks Edna Bell
2011 Jan 17
2
How to still processing despite bug errors?
...re consistent but > only the 3SLS estimator is (asymptotically) efficient. Under the > alternative hypothesis the 2SLS estimator is consistent but the > 3SLS estimator is inconsistent. > > The Hausman test statistic is > > m = ( b_2 - b_3 )' ( V_2 - V_3 ) ( b_2 - b_3 ) > > where $b_2$ and $V_2$ are the estimated coefficients and their > variance covariance matrix of a _2SLS_ estimation and $b_3$ and > $V_3$ are the estimated coefficients and their variance covariance > matrix of a _3SLS_ estimation. > > =...