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7 results for “from:Dan Stanger”

Cluster analysis question
Dan Stanger · Feb 6, 2009 · r-help

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Newbie question about vector matrix multiplication
Dan Stanger · May 14, 2008 · r-help

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Summing using a boolean index vector
Dan Stanger · Jun 18, 2010 · r-help

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Summing using a boolean index vector (repost in plain text).
Dan Stanger · Jun 18, 2010 · r-help

Hello all: I have a dataframe f of weekdays and value, and a Boolean vector with Fridays set to true, and other days set to false, created by fridays<-(diff(f$weekdays) < -1). I would like to create a vector...

Newbie question about vector matrix multiplication
Dan Stanger · May 14, 2008 · r-help

Hello Abhijit, When I try that, I get: > diag(w)%*%co%*%diag(w) Error in diag(w) %*% co : requires numeric matrix/vector arguments Dan Stanger Eaton Vance Management 200 State Street Boston, MA 02109 617 598 8261 -----Original Message----- From...

Newbie question about vector matrix multiplication
Dan Stanger · May 14, 2008 · r-help

Hi Phil, That solved the problem. Thanks, Dan Stanger Eaton Vance Management 200 State Street Boston, MA 02109 617 598 8261 -----Original Message----- From: Phil Spector [mailto:spector at stat.Berkeley.EDU] Sent: Wednesday, May 14, 2008 3:42 PM...

Summing using a boolean index vector (repost in plain text).
Dan Stanger · Jun 18, 2010 · r-help

Hello Jim, Thank you for getting back to me. Cumsum does exactly what I needed as the following example shows. [1] TRUE FALSE FALSE FALSE TRUE FALSE FALSE FALSE FALSE TRUE FALSE FALSE FALSE FALSE TRUE FALSE > cumsum(x) [1...

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