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QUESTION
I have two data below:
...ANSWER
Answered 2021-Jun-11 at 08:10You can try like below
QUESTION
As per this Medium post, I'm trying to setup a local Next.js development server with HTTPS.
But when I run this command in Windows 10 Powershell:
...ANSWER
Answered 2021-Apr-15 at 11:40The command is for bash so obviously it can't run in PowerShell. There are many changes necessary
- PowerShell currently doesn't support process substitution (which is that
<(command)
part) so you must save the output into file - The escape character in PowerShell is
`
and not\
so you must replace all those escape characters to the correct one
So the result would be something like this
QUESTION
I have a Task
app in my django project.
So this is the base class for the task model:
...ANSWER
Answered 2021-Jun-09 at 04:23it's because you're overriding the name of real database field with a property of the model.
QUESTION
I have a specific API I call to get a PDF, and it works perfectly with curl:
...ANSWER
Answered 2021-Jun-07 at 13:03PDFs are not entirely text files, so trying to read it as one with .text()
is introducing errors into the binary parts of it (e.g. the graphics!).
You need r.blob()
.
QUESTION
I am trying to implement NLPCA (Nonlinear PCA) on a data set using the homals
package in R
but I keep on getting the following error message:
Error in dimnames(x) <- dn : length of 'dimnames' [1] not equal to array extent
The data set I use can be found in the UCI ML Repository and it's called dat
when imported in R
: https://archive.ics.uci.edu/ml/datasets/South+German+Credit+%28UPDATE%29
Here is my code (some code is provided once the data set is downloaded):
...ANSWER
Answered 2021-Jun-06 at 17:37It seems the error comes from code generating NAs in the homals
function, specifically for your data for the number_credits
levels, which causes problems with sort(as.numeric((rownames(clist[[i]]))))
and the attempt to catch the error, since one of the levels does not give an NA value.
So either you have to modify the homals
function to take care of such an edge case, or change problematic factor levels. This might be something to file as a bug report to the package maintainer.
As a work-around in your case you could do something like:
QUESTION
In rows, 11:13, and in 14:16, it can be observed that there are duplicate entries in column 'C2_xsampa' for 'm:' and 'n:'. Each value in 'C2_xsampa' has two levels, Singleton or Geminate but it is not the case among 'm:' and 'n:'. This yields wrong mean values for numeric columns.
My question is: How do I filter which row is being duplicated? I have manually checked the parent dataset through which means values are obtained. All looks fine there.
Earlier, I was using subset () to rectify the 'real' errors in entry.
Data:
...ANSWER
Answered 2021-Jun-06 at 07:54You could check that the values for the two columns are unique throughout the dataset
df = df.drop_duplicates(subset=['C2_xsampa','Consonant'])
You can get the inverse df[~df]
to get the rows that are incorrect
edit just saw the r language tag
I believe distinct(select(df, C2_xsampa, Consonant))
will do
QUESTION
so I have this json response from an API call
...ANSWER
Answered 2021-Jun-01 at 18:50If d
contains the dictionary from the question, you can use this example:
QUESTION
I have a problem entering the date; I have a form consisting of prodcode, name and date (where the latter has been saved as a String). I try to test it with Postman by inserting the following example fields: { "prodcode": "PC001", "name": "Personal Computer", "date": "11/23/2020" }
and when I go to save it in the db I get the following error:
Data truncation: Incorrect datetime value: '23 -11-2020 'for column' data 'at row 1
This is the code of interest:
Product.java
...ANSWER
Answered 2021-Jun-01 at 11:49Try to use date instead of string for the date. and use @DateTimeFormat
QUESTION
ANSWER
Answered 2021-Jun-01 at 09:59You can use set_edge_attr
like below
QUESTION
I am struggling with a probably minor problem while calling compiled ODEs to be solved
via the R package 'deSolve'
and I seeking advice from more expert users.
I have a couple of ODE systems to be solved with 'deSolve'
. I have defined the ODEs in separate C++ functions (one for each model) I am calling through R in conjunction with 'Rcpp'
. The initial values of the system change if the function takes input from another model (so basically to have a cascade).
This works quite nicely, however, for one model I have to set the initial parameters for t < 2
. I've tried to do this in the C++ function, but it does not seem to work.
ANSWER
Answered 2021-May-28 at 14:25I was able to reproduce your code. It seems to me that this is indeed elegant, even if it does not leverage the full power of the solver. The reason is, that Rcpp creates an interface to the compiled model via an ordinary R function. So back-calls from the slovers (e.g. lsoda) to R are necessary in each time step. Such back-calls are not for the "plain" C/Fortran interface. Here communication between solver and model takes place at the machine code level.
With this informational, I can see that we don't need to expect initialization issues at the C/C++ level, but it looks like a typical case. As the model function is simply the derivative of the model (and only this). The integration is done by the solver "from outside". It calls the model always with the actual integration state, derived from the time step before (roughly speaking). Therefore, it is not possible to force the state variables to fixed values within the model function.
However, there are several options how to resolve this:
- chaining of lsoda calls
- use of events
The following shows a chained approach, but I am not yet sure about the initialization of the parameters in the first time segment, so may only be part of the solution.
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