I’m trying to pass a matrix as data to a stan model (via cmdstanr), but somehow the data gets read as a vector, generating the following error message: mismatch in number dimensions declared and found in context; processing stage=data initialization; variable name=k; dims declared=(3,9); dims fou…

Just a quick follow up that this issue has been resolved in cmdstanr. If you encounter it, please upgrade to the latest version of cmdstanr: remotes::install_github("stan-dev/cmdstanr") Thanks again for reporting!

Hey @fusaroli , thanks for the report. Here is a simplified version of where we could see this issue: library(cmdstanr) t <- c(1, 2, 4, 7, 12, 21, 35, 59, 99, 200) nt <- length(t) slist <- 1:4 ns <- length(slist) k1 <- matrix(c(18, 18, 16, 13, 9, 6, 4, 4, 4, NA, 17, 13, …

thank you. Here is what I get: { "k": [ [18, 18, 16, 13, 9, 6, 4, 4, 4], [17, 13, 9, 6, 4, 4, 4, 4, 4], [14, 10, 6, 4, 4, 4, 4, 4, 4] ], "n": 18, "t": [1, 2, 4, 7, 12, 21, 35, 59, 99, 200], "ns": 4, "nt": 10 } so this seems to work

Ok, nevermind me, its a bug with cmdstanr. We try to pre-process the data based on the info in the Stan model (dimensions). This was added because R does not differentiate between an array and a scalar really. Seems that added a bug for this case. Not immediately sure how, but I guess thats how bugs…

Mismatch in number of dimensions declared and found

Modeling

fusaroli September 28, 2021, 12:41pm 5

much obliged! thanks!

2d array of integers from R...why is this failing?

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Mismatch in number of dimensions declared and found

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