# warnerchang

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Never be afraid to try something new

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English

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**Feeds**

How to make a graph (or part of a graph) of space from a given equation or inequality

Anything like this: phi=0:0.1:pi; theta=0:0.1:pi/2; [phi,theta]=meshgrid(phi,theta); x1=4.*sin(phi).*cos(theta); y1=4.*sin(...

5 months ago | 0

Question

what happens behind "/"

[2:6]/[3:7] Ans = 0.8148 what happens behind this operation? Is there any algorithm?

10 months ago | 2 answers | 0

### 2

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？

2 years 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...

2 years 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...

2 years 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 ...

2 years ago | 2 answers | 0

### 2

answersQuestion

what is the time complexity of function 'reshape'

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

2 years 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...

2 years 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?

2 years 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 ...

2 years 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)=[];

2 years ago | 1 answer | 2