# Guoyi Xu

### MathWorks

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**Content Feed**

Solved

Sum the rows

Sum the rows of the given matrix. Example x = [ 1 2 3 4 ] y = [ 3 7 ]

9 months ago

Solved

Find the missing numbers.

Total *N* numbers are in the series of natural numbers ( *1,2,3,...,N* ). The input is an array (unsorted) of those natural num...

9 months ago

Solved

Make an identity matrix whose diagonal elements are 1:n

For a given input n, make an n by n identity matrix that contains the elements 1:n along its diagonal. For example, if input=5: ...

9 months ago

Solved

Increment up an input vector

Increment up an input vector by adding the indices to the vector values. For example, if an input vector is [3, 2, 6, 1, 6], the...

9 months ago

Solved

Calculating the total earnings of a factory

The row vector, prods contains the number of various products manufactured per hour. The second row vector, prices holds values ...

9 months ago

Solved

Remove all the columns contains only zero

Remove the column from the matrix which has only zeros . Refer the Example below a= 1 0 3 0 23 0 56 0 1 ...

9 months ago

Solved

what's my tax amount this year ?

given an annual salary x and a tax rate i calculate the amount that you have to pay.Example x = 70000; i=.10 y_correc...

9 months ago

Solved

short or buy ? take the opportunity

you had already calculated a theoretical stock value, now you checked in bloomberg the quoted price of that stock and you have t...

9 months ago

Solved

Slope of the line passing through two points

Determine the slope of a line passing through the points a=[x1 y1] and b=[x2 y2].

9 months ago

Solved

I told you not separate me, but you did :( - ACDC

Given input vector, output it's DC and AC value Example: input = 0 1 -1 0 ac = 0 1 -1 0 dc = 0

9 months ago

Solved

Calculate solution of given polynomial

For example, y=function([3 -2 -4]) In here, input vector indicate 3*x^2-2*x-4, y is solution of former equation. y=[1.5...

9 months ago

Solved

Finding two missing number in 1 to n array

You are given an array of numbers from 1 to n with two missing numbers. Return the two missing numbers. Input: x=[5 2 0 1 ...

9 months ago

Solved

Calculate cosine without cos(x)

Solve cos(x). The use of the function cos() and sin() is not allowed.

9 months ago

Solved

currency converter

given a rate of exchange calculate the equivalent units of 100 USD

9 months ago

Solved

Create a square matrix with given conditions

Create a square matrix, M, which should be populated as follows: M = [ n^2 n * (n-1) n * (n-2) ... n * 2 n * ...

9 months ago

Solved

Delete x value in given vector y.

Delete x value in given vector y. Exapmle x=5; y=[ 1 2 5 6 74 5 2 5] result=[1 2 6 74 2]

9 months ago

Solved

Set x value to each odd index of vector y.

Set x value to each odd index of vector y.

9 months ago

Solved

Modulation index

The amplitude of the carrier signal is 2V and the amplitude of the modulating signal is 8V. Find its modulation index.

9 months ago

Solved

Solve expression II

Solve given expression. alpha=0.1(-x-y-50)/(exp((-x-y-50)/10)-1) beta=5exp((-x+y-60)/20) result=alpha+beta;

9 months ago

Solved

Solve expression I

Solve expression (1+sin(x))/cos(x)+cos(x)/(1+sin(x)) for given vector x.

9 months ago

Solved

For a rectangle, if x is the length and 2x is width. Then find out x from the area of the rectangle?

For a rectangle, if x is the length and 2x is the width. Then find out x from the area of the rectangle? if the area is equal...

9 months ago

Solved

Sum positive elements of matrix.

Calculate sum of positive elements of the matrix.

9 months ago

Solved

Find sum of negative elements in row.

Find sum of negative elements in row. Example x=[1 -5 3 4 -6 6 7 8 9 10] result = -11

9 months ago

Solved

Implement zero-based indexing for Matrices

Given an input vector and position (which is zero based) output the value Example: x = [1 2; 4 5] pos = [0 1] value = 5 ...

9 months ago

Solved

Create tangent function out of sine function only

Please don't use cosine and tangent functions

9 months ago