### Question Description

I uploaded the assignment. there are 7 parts using Matlab program.

Part I: File Directory

Part II: MATLAB commands/functions and matrix manipulations

Part III: Plotting cosine curve

Part IV: Calculating the average molar mass on Mars.

Part V: Normal Distribution

Part VI: Statistics Measures and plotting

Part VII: Statistics Measures and Plotting

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## Final Answer

Hi, is it okay if I request another 1 hour?

Attached.

GEOG 444 Midterm:

Due @ 12pm noon on Tuesday, October 16th, 2018

Name:

Part I: File Directory

Use the image below of the directory structure and write down your answer after each question after

the provided prompt “>>”. (1 pt each)

C:\

Midwest

Iowa

Kansas

Nebraska

Columbia

South

Northeast

Missouri

StLouis

UMKC

West

Oregon

LosAngeles

KansasCity

Rockhurst

California

DeVry

UCLA

SanFrancisco

USC

1) Assume you are currently in the root directory C:\. What is the MATLAB command to go

to the directory called “Kansas” using a relative path?

>>C:\Midwest\Kansas

2) Assume you are in the “Midwest” folder. Write the command to change directories to

“UMKC” directory.

a) relative path:

>> cd ./moves/down/a/UMKC

b) absolute path:

>> Midwest/Kansas/UMKC

3) Assume you are in the “UMKC” folder. Write the command to change directories to

“UCLA” directory.

a) relative path:

>>UMKC\UCLA

1

GEOG 444 Midterm:

b) absolute path:

>>cd\UMKC\move\UCLA

4) What command will output your current working directory?

>> /directory/newhomedirectory/

5) What command will display the contents of the current directory?

>>C:\Program Files\Matlab\myfiles

6) What command will display all the files with extension .mat ?

>>C:\Program Files\Matlab\R2018b\myfiles\display

Part II: MATLAB commands/functions and matrix manipulations (1 pt each)

Find out the MATLAB commands to do the following operations.

1) Round a number X towards nearest integer. Assume X = –3.14, write down the answer.

>> round(x) = int(0.1)

>> round (-3.14) = int (0.1) = -3

2) Round a number X to the nearest integer towards plus infinity. Assume X = –3.14, write down

the answer after you apply the command.

>> round(x) = int(x+0.1)

>> round (-3.14) = int (1.0) = -3

3) Round a number X to the nearest integer towards minus infinity. Assume X = –3.14, write down

the answer after you apply the command.

>> round(x) = int(x-0.1)

>>round(-3.14) = int (-0.1) = -3

4) Find out the MATLAB command to generate a random integer between –9 and 2.

>> B=randi([-9,2])

5) Find out the MATLAB command to calculate the absolute value of a number x= –2.7183, write

down the answer after you apply the command.

>> y = abs(x)

>> y = abs (-2.7183) = -2.7183

6) Find out the MATLAB command to calculate magnitude of 3-dimensional vector x = [–2 –3 4],

2

GEOG 444 Midterm:

write down the answer after you apply the command.

>> v = [-2 -3 4];

n = norm(v)

>>n = 5.385

3

GEOG 444 Midterm:

7) Find out the MATLAB codes (2 methods) that makes a column vector called “vector1” that holds

all odd numbers from 1 to 21.

Method #1:

>> j=1;

k=1;

for i=1:21

if mod(i,2)==0 && i~=1

else

odd(k)=i;

end

odd

Method #2:

>> x=1;

y=21;

v=x+1:y-1

v_odd=v(mod(v,2)~=0)

8) Subtraction of two vectors: vector x1= [–3 1], and vector, x2= [1 –2],

a) draw the subtraction of x1 – x2 in x-y coordinates

codes: for

i=1:length(x)-1

min=i;

for j=i+1:length(x)

if x(j)> X1 = [-3 1];

X2 = [2 -2];

Z = X1 - X2

>> Z = 1 x 2

-5 3

9) MATLAB command to get the

a) size of a matrix

>> clc

a=[-3 1; 2 -2]; // can be any matrix

[r c] = size(a); %determine size of input

m = ones(r,c); %preallocate r x c ...

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