# Hwajin Choi

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Question

How can I use for loop to sum some numbers for a certain time?

I want to sum a set of numbers (10 numbers in the set) for a certain time (user input) My code is time = input('Put numbers...

3 months ago | 1 answer | 0

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answerQuestion

How can I randomly select one variable between 3 variables?

I want to randomly select 1 variable between variables 10, 20, and 30. This is what I did and it failed. a = [10:10:30] rand(...

3 months ago | 1 answer | 0

### 1

answerQuestion

How can I draw delta robot workspace in 3D graphic?

Hello I want to know how to draw a 3D graphic of workspace of my delta robot as shown in the image below. I got forward kin...

9 months ago | 0 answers | 0

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answersQuestion

How can I plug inverse kinematics to a Simscape multibody?

Hello, This is my Simulink model of a delta robot using Simscape multibody. I have an inverse kinematics matlab code. How can I...

1 year ago | 1 answer | 0

### 1

answerQuestion

What's the value of Ki in PD controller?

I designed PD controller and got Kp and Kd. When I use feedback command like feedback(sys*pid(Kp,Ki,Kd),1), what value should ...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to plug in trajectory to the Simscape multibody

Hello, I am doing a project to make a delta robot move according to an inverse position kinematics. I have used Simscape multi...

1 year ago | 0 answers | 0

### 0

answersQuestion

How can I animate a robot CAD model corresponding to my MATLAB code?

Hello, I have a CAD(SolidWorks) assembly of a robot arm and a MATLAB code of inverse position kinematics. I want to animate the...

1 year ago | 1 answer | 0

### 1

answerQuestion

Lag Compensator Simulink Model

I have a lag compensator like below from the MATLAB script. I want to make it in Simulink. What block should I use and how shou...

1 year ago | 1 answer | 0

### 1

answerQuestion

How to 3D plot a circle with radius of 1 in x y and sine wave in z?

Hello, I want to 3D plot a circle looks like the image below. (Sorry for the poor drawing) The figure is a circle of radius 1 i...

1 year ago | 2 answers | 0

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answersQuestion

How to plot trajectory of angles at varying x, y, and z position

Hello, I want to plot trajectory of angles theta1, theta2, and theta3 vary depending on xyz position in 2D or 3D. I got the th...

1 year ago | 1 answer | 0

### 1

answerQuestion

How can I convert x, y, and z which are functions of theta to theta function of x, y, and z?

Hello, I have three equations, eqn1 = 2*L*(y+a)*cos(theta1) + 2*z*L*sin(theta1) + x^2 + y^2 + z^2 + a^2 + L^2 + 2*y*a - l^2 ==...

1 year ago | 1 answer | 0

### 1

answerQuestion

Pick one value from multiple results

A solve command finds four solutions like, X1 = 0.5017 -0.5017 0.5017 -0.5017 how can I pick only the firs...

1 year ago | 1 answer | 0