error: $ operator is invalid for atomic vectors

The t-test runs fine every time I run the chunk it's in, but then when I try to knit my entire notebook to a PDF, it says that there is an error in hd$maxheartrate and says '$ operator is invalid for atomic vectors. I've done the preprocessing to reshape de data to the required input format (counts and expression matrices with cells as rows and genes as columns.

'$maxheartrate' is looking at the maximum heart rate for each of the patients in both samples. I've been trying to run Dyno so as to proceed to lineage inference from a public dataset. 'hd' and 'nohd' are subsets of the main data that observe all of the other variables but only for patients with and without heart disease respectively. In the original data set, having heart disease is noted as 1 while not having heart disease is noted as 0. 'hd' and 'nohd' are two specific subsets of a data set I imported into Rstudio about heart disease. You are treating x like a dataframe but it is a vector.

T.test(hd$maxheartrate,nohd$maxheartrate) You cannot use the operator to extract from an atomic vector (it does not make sense, there are no variables to extract from a vector). I'm running into the error in the title every time I attempt to knit my notebook to a PDF. 4731 2086 According to the HTTP/1.1 Spec: The POST method is used to request that the origin server accept the entity enclosed in the request as a new subordinate of the resource identified by the Request-URI in the Request-Line In other words, POST is used to create. Hi, I'm very new to Rstudio and am currently using it for a summer statistics course.

Error: $ operator is invalid for atomic vectors