let mat be a matrix of integers in r. write a function to find how many rows have exactly two instances of the number 7
seven=0
count=0
for(i in 1:nrow(mat)){
for(j in 1:ncol(mat)){
if(mat[i,j]==7){count=count+1}}
if(count==2){seven=seven+1
count=0}}
seven
seven gives the no of instances of exactly two 7 in a row.
let mat be a matrix of integers in r. write a function to find how many...
Write a C++ function that initializes all the elements of M × N matrix mat to 0.
please answer both questions thank you! How many rows and columns must a matrix A have in order to define a mapping from R into R by the rule T(x) Ax? Choose the correct answer below OA. The matrix A must have 7 rows and 7 columns. O B. The matrix A must have 9 rows and 7 columns OC. The matrix A must have 9 rows and 9 columns O D. The matrix A must have 7 rows and...
R assignment In the matrix() function: . The first argument is the collection of elements that R will arrange into the rows and columns of the matrix. Here, we use 1:9 which is a shortcut for c(1, 2, 3, 4, 5, 6, 7, 8, 9) e The argument byrow indicates that the matrix is filled by the rows. If we want the matrix to be filled by the columns, we just place byrow FALSE. . The third argument nrow indicates...
Find how many positive integers with exactly four decimal digits, that is, positive integers between 1000 and 9999 inclusive, have the following properties: (a) are divisible by 5 and by 7. (b) have distinct digits. (c) are not divisible by either 5 or 7.
(6) Let A denote an m x n matrix. Prove that rank A < 1 if and only if A = BC. Where B is an m x 1 matrix and C is a 1 xn matrix. Solution (7) Do the following: (a) Use proof by induction to find a formula for for all positive integers n and for alld E R. Solution ... 2 for all positive (b) Find a closed formula for each entry of A" where A...
math proof - 1 Problem I. (a) Let R be an 82 × 4 rectangular matrix each of whose entries are colored red, white or blue. Explain why at least two of the 82 rows in R must have identical color patterns (b) Conclude that R contains four points with the same color that form the corners of a rectangle. (c) Now show that the conclusion from part (b) holds even when R has only 19 rows. Hint: How many...
1. Write a MATLAB function that takes a matrix, a row number and a scalar as arguments and multiplies each element of the row of the matrix by the scalar returning the updated matrix. 2. Write a MATLAB function that takes a matrix, two row numbers and a scalar as arguments and returns a matrix with a linear combination of the rows. For example, if the rows passed to the function were i and j and the scalar was m,...
Sketch any graph with five nodes that contains exactly two triangles. Let M be the adjacency matrix for your graph. Write down the matrix M3 . How could the matrix M3 be used to identify that the graph contains exactly two triangles?
Matlab problem Write a function matsort to sort all of the values in a matrix (decide whether the sorted values are stored by row or by column). It will receive one matrix argument and return a sorted matrix. Do this without loops, using the built-in functions sort and reshape. For example: >> mat mat- 4 5 2 1 3 6 7 8 4 9 1 5 >> matsort(mat) 1 4 6 1 4 7 2 5 8 3 5 9...