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Can't create design matrix from user input

By : puneetha
Date : October 18 2020, 06:10 PM
like below fixes the issue We can use as.formula to construct a formula to be used in model.matrix based on a user-specified predictor variable var1
code :
var1 <- "X"
model.matrix(as.formula(sprintf("~ 0 + %s", var1)), data = df)
model.matrix(~ 0 + X, data = df)
df <- read.csv(text =

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Create a basic matrix in C (input by user !)

By : Skjalg
Date : March 29 2020, 07:55 AM
Does that help How about the following?
First ask the user for the number of rows and columns, store that in say, nrows and ncols (i.e. scanf("%d", &nrows);) and then allocate memory for a 2D array of size nrows x ncols. Thus you can have a matrix of a size specified by the user, and not fixed at some dimension you've hardcoded!
code :
for(i = 0; i < nrows; ++i)
   for(j = 0; j < ncols ; ++j) 

CouchDB - How to create dynamic design docs based on end user input

By : Marckx
Date : March 29 2020, 07:55 AM
To fix this issue In a nutshell, you would need to emit something like this in the view:
code :
emit([doc.contentType, doc.addDate], doc); // emit the entire doc, 
// add date is timestamp (assuming)
emit([doc.contentType, doc.addDate], null); // use with include_docs=true
startkey   = ["post",0] = contentType is post, and addDate >= 0
endkey     = ["post",9999999999] = contentType is post, and addDate <= 9999999999
limit      = 5, limit to five posts
descending = true = sort descending, which is sort by adddDate descending

How to create table/matrix using user input?

By : sheraz ahmed
Date : March 29 2020, 07:55 AM
hop of those help? I want to create a 4 times 4 matrix/table by prompting the user for a value between 1 and 16, and filling the matrix with these values. I used: , You can just move the input in the for-loop. Like this:
code :
ROWS = 4

square_matrix = [
    [0, 0, 0, 0],
    [0, 0, 0, 0],
    [0, 0, 0, 0],
    [0, 0, 0, 0]

for i in range(ROWS):
    for j in range(COLUMNS):
        number = int(input("Enter a value between 1 and 16: "))
        square_matrix[i][j] = number

Getting a Compile error when trying to create matrix with user input. JAVA

By : Uma Maheshwar Reddy
Date : March 29 2020, 07:55 AM
I wish this helpful for you You are trying to call int n = getMatrixSize(); with no arguments, but your method public static int getMatrixSize(int n) accepts an integer as argument. That's the reason you are getting an error.
Remove int n from parameter of getMatrixSize() and your code will work fine.

How to design ASP.NET Core - SQL application where user should be able to create forms of different input items and stor

By : Girard Media
Date : March 29 2020, 07:55 AM
I wish this help you Some time ago, I was working on some simular project. We don't store each of our form field in DB, because we don't want to update DB each time we need to add some new-kind-of-form-field. We believe it's up to HTML+JS to decide what kind of input to use with particular object property.
We create a serializer, that serialize form structure in xml and store it in DB. In this xml we keep a TableName (EF DataSet<> name) and ColumnName (name of model property) for each FormField.
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