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# Homework #1 | |
## due 9/15/17 | |
1. The first assignment is to fork the course syllabus and assignment. | |
a. Sign into your UConn github account via | |
[github.uconn.edu](https://github.uconn.edu/). | |
![Step 1](./images/g1.jpg) | |
![Step 2](./images/g2.jpg) | |
b. Go to | |
[https://github.uconn.edu/rcc02007/ME3255S2017.git](https://github.uconn.edu/rcc02007/ME3255S2017.git) | |
and watch the repository. | |
c. Fork the repository to create your own version of the syllabus and assignments. | |
2. The next assignment is to create your own repository named '01_ME3255_repo'. | |
a. (if you signed out) Sign into your UConn github account via | |
[github.uconn.edu](https://github.uconn.edu/). | |
b. Follow these steps to create your own repository named `01_ME3255_repo`: | |
i. Click the +-sign and choose 'New repository' | |
![Step 3](./images/g3.jpg)\ | |
ii. In the 'Repository name' enter '01_ME3255_repo'. Add a description. Make it | |
private. Then check the box 'Initialize this repository with a README'. | |
![Step 4](./images/g4.jpg)\ | |
iii. Now you are in your repo. Click on the README.md file and then click the | |
pencil to edit it. | |
![Step 5](./images/g5.jpg)\ | |
iv. Add a header with a `#` and type `# Answer to Homework Question`. Under this | |
line answer this question: What do you hope to learn this semester? | |
![Step 6](./images/g6.jpg)\ | |
v. At bottom of page, click 'Commit changes'. | |
![Step 7](./images/g7.jpg)\ | |
vi. Verify that your README.md file has been updated. Then copy the HTTPS clone | |
URL on the right of the page. | |
![Step 8](./images/g8.jpg)\ | |
vii. Paste this into the Homework #1 Google form reponse. | |
[https://goo.gl/forms/b3YrBuFxZaXTYV5s1](https://goo.gl/forms/b3YrBuFxZaXTYV5s1) | |
![Step 9](./images/g9.jpg)\ | |
viii. Click on the gear for "Settings" then "Collaborators" on the left menu. Add | |
`rcc02007` (Ryan C. Cooper) and `zhs15101` (Zhiqiang Shen) as a collaborators. | |
3. Use a script to create a variable called `A_66`, where every element is the product | |
of the two indices from 1 to 6 e.g. A_66(3,2)=6 and A_66(4,4)=16. Calculate the mean and | |
standard deviation of the values in A_66. | |
4. Copy the data in | |
[US_energy_by_sector.csv](https://github.uconn.edu/rcc02007/ME3255F2017/blob/master/03_Intro%20to%20matlab-octave/US_energy_by_sector.csv) | |
to a file in you working directory in Matlab/Octave. Add these two plots to your | |
01_ME3255_repo with a heading of `#Problem 4` | |
a. Plot the US energy consumption from 1949 to 2016 for "Total Energy Consumed by the | |
Residential Sector" and "Total Energy Consumed by the Transportation Sector" in trillions | |
of Btu's. | |
b. Plot the cumulative US energy consumption from 1949 to 2016 for "Total Energy Consumed by the | |
Residential Sector" and "Total Energy Consumed by the Transportation Sector" in quintillions | |
of Btu's (1 quintillion = 10$^6$ trillion). The cumulative energy is the area under | |
the curve in part a from 1949 to a given year. | |
5. In this part, you will modify the function presented in lecture `freefall.m`. In | |
lecture, the function required an input of `N` to divide the 12 second solution into | |
N-steps. Here, modify the input so that you can specify two inputs, step size-`h`, and | |
timespan-`timespan`. | |
a. Plot a comparison between calculated velocities v(t) for timesteps of h=0.1, 1, and | |
5 sec from 0 to 30 seconds. | |
b. Save the script that created the comparison plot as 'freefall_comparison.m' and the | |
figure as figure01.png (use command `> print(figure01.png)`) | |
c. Save your work to a folder called 'problem_3' and add it to the '01_ME3255_repo' | |
repository | |
6. In this part we will create functions that calculate velocity and acceleration in 3D | |
based upon x,y,z-coordinates and time. | |
a. Create a function that takes four vectors as input, x,y,z,t,(where x,y,z are | |
coordinate positions in meters) and its output are three vectors [vx,vy,vz] which are | |
velocity components in m/s. | |
b. Create a function that takes four vectors as input, x,y,z,t,(where x,y,z are | |
coordinate positions in meters) and its output are three aectors [ax,ay,az] which are | |
acceleration components in m/s$^2$. |