# warnerchang

Never be afraid to try something new

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**Content Feed**

Solved

Plotting Practice

Plot cos(x) vs x as shown in the figure below. Include the appropriate title, x-label, and y-label. Note, it is case sensitive. ...

4 months ago

Solved

Dog Statistics

The vectors ht and wt contains the heights and weights of 20 golden retrievers. In some cases, it was not possible to make both ...

4 months ago

Solved

Determine if x is a combination of m and n

Given positive integers x, m, and n, determine if x can be written as x = am + bn for any (non-negative) integers a and b. Your ...

4 months ago

Solved

Create an arrow matrix

An arrow matrix is a square matrix that contains ones on the diagonal, the last column, and last row. ...

4 months ago

Solved

Calculating Student Grades

The matrix grades contains raw grades for 7 students who took your course. Each row represents a different student. The first 7 ...

4 months ago

Solved

Simpson's Paradox - Calculate correlation coefficients for groups of data

Simpson's Paradox is a statistical phenomenon where groups of data can have a characteristic while the whole data set together h...

4 months ago

Solved

Find the minimum of the column-maximums of a matrix

Given a matrix A, find the maximum value of each column, then return the smallest of those maximum values (ie return the minimum...

4 months ago

Solved

Calculate the mean of each half of a matrix

Given a matrix with an even number of columns, n, return a 1-by-2 row vector where the first element is the mean of all the elem...

4 months ago

Solved

Find Closest Constant

Given a number x, return the value that is closest to x from this list of constants: 0, 1, , e, , (also known as ). For exampl...

4 months ago

Solved

Matrix Quadrants

Write a function that takes N as the input, and outputs a matrix whose upper-left (NxN) quadrant contains all ones, the lower-ri...

4 months ago

Question

How to plot a 3D disk with several holes quickly?

I used "patch" to plot a 3D disk with single central hole successfully, however, I do not know how to plot a 3D disk with severa...

8 months ago | 0 answers | 0

### 0

answersQuestion

Ｌｉｍｉｔ ａｎｇｌｅ ｉｎ ［－９０，９０］ ｄｅｇｒｅｅ

Aｓ Ｉ ｗａｓ ｕｓｉｎｇ ｏｄｅ４５ ｔｏ ｓｏｌｖｅ ＯＤＥｓ， Ｉ ｄｏ ｎｏｔ ｋｎｏｗ ｔｏ ｌｉｍｉｔ ｔｈｅ ｒｅｓｕｌｔ ｉｎ ［－９０，９０］ ｄｅｇｒｅｅ． Ａｎｙｏｎｅ ｍａｙ ｐｒｏｖｉｄｅ ｓｏｍｅ ｈｅｌｐ？

9 months ago | 1 answer | 0

### 1

answerQuestion

label is not at the center of axes

when I was plotting a 3D line, I tried to use xlabel/ylabel to make a axis label. However, I found these labels are not at the c...

10 months ago | 1 answer | 0

### 1

answerQuestion

how can I change lighting using codes?

Now, I plot a figure, however, it is dark. And I use the button to change the lighting, I am wondering whether there exists a me...

10 months ago | 1 answer | 0

### 1

answerQuestion

How to define a colormap easily

I tried to define a colormap, however it is rather difficult, because I have to choose a value and then I see what the color it ...

10 months ago | 2 answers | 0

### 2

answersQuestion

what is the time complexity of function 'reshape'

anyone knows what is the time complexity of function 'reshape'?

10 months ago | 2 answers | 0

### 2

answersQuestion

why use limit function goes wrong

syms x f=(2/pi*atan(x))^x; limit(f,x,inf,'right') Prompt：Inconsistent limit direction. however，I tried to transform the f...

10 months ago | 1 answer | 0

### 1

answerQuestion

How to adjust the brightness of an image in YCbCr color space

anyone know how to adjust the brightness of an image in YCbCr color space?

10 months ago | 1 answer | 0

### 1

answerQuestion

Why two methods give different results, and which is correct?

I use ode15i and ode45 to solve an implicit function, however two methods give different results, which is correct? clear clc ...

10 months ago | 1 answer | 0

### 1

answerQuestion

why it will go wrong using 'cell'?

Recently, I ran two codes as follow: a={[],[]};a{1}(a{1}==3)=[]; % it will go wrong b=cell(1,2);b{1}(b{1}==3)=[];

10 months ago | 1 answer | 2