PLOTING DATA INTO GRAPHICS

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meoui 2024-8-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2148059-ploting-data-into-graphics

编辑： DGM 2024-8-28

EXECUTE THE RESULTS OF NUMBER, MATRIX, VECTOR OPERATIONS AND CONVERT THEM INTO GRAPHICS?

form book: Menke, W., 2024, Geophysical Data Analysis and Inverse Theory, Academic Press.

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meoui 2024-8-27

how CREATE A PRORAM BY PLOTING A DATA MATRIX, VECTOR

DGM 2024-8-28

编辑：DGM 2024-8-28

在 MATLAB Online 中打开

There is no specific question. If you want to practice, just start practicing.

% some matrices

A = [1 0 2; 0 1 0; 2 0 1];

B = [1 0 -1; 0 2 0; 1 0 3];

C = [2 0 1; 0 3 0; 3 0 4];

% some column vectors

a = [1; 3; 5];

b = [2; 4; 6];

% basic matrix arithmetic

S = A + B

S = 3x3

2 0 1 0 3 0 3 0 4

D = A - B

D = 3x3

0 0 3 0 -1 0 1 0 -2

P = A * B

P = 3x3

3 0 5 0 2 0 3 0 1

% various notes from the body text

% the text emphasizes that these aren't generally equivalent

% but the book gives a poor example since A = A' in this case

Q1 = A'*B

Q1 = 3x3

3 0 5 0 2 0 3 0 1

Q2 = A*B

Q2 = 3x3

3 0 5 0 2 0 3 0 1

% multiplication is not commutative

% these should differ

P1 = A*B

P1 = 3x3

3 0 5 0 2 0 3 0 1

P2 = B*A

P2 = 3x3

-1 0 1 0 2 0 7 0 5

% multiplication is associative

% these should be the same

P3 = (A*B)*C

P3 = 3x3

21 0 23 0 6 0 9 0 7

P4 = A*(B*C)

P4 = 3x3

21 0 23 0 6 0 9 0 7

% multiplication is distributive

% these should be the same

P5 = A*(B+C)

P5 = 3x3

11 0 14 0 5 0 10 0 7

P6 = A*B + A*C

P6 = 3x3

11 0 14 0 5 0 10 0 7

% the transpose of a product

% these should be the same

P7 = (A*B)'

P7 = 3x3

3 0 3 0 2 0 5 0 1

P8 = B'*A'

P8 = 3x3

3 0 3 0 2 0 5 0 1

% equivalent forms of the inner product

% these should be the same

s1 = a'*b

s1 = 44

s2 = b'*a

s2 = 44

% sum of squares (squared length)

sl = a'*a

sl = 35

% the outer product

os = a*b'

os = 3x3

2 4 6 6 12 18 10 20 30

% this is a literal character vector

myfilename = 'mydata.txt'

% programmatically generate character vectors

k = 1;

myfilename = sprintf('myfile_%03d.txt',k) % use leading zeros

myfilename = 'myfile_001.txt'

d = 10.40;

mysentence = sprintf('distance d is %.2f football fields',d)

mysentence = 'distance d is 10.40 football fields'

% get some data from somewhere

tbl = readmatrix('TemperatureData.csv','range','C1:D32');

day = tbl(:,1);

temp = tbl(:,2);

% and make a graph

hold on

set(gca,'linewidth',2,'fontsize',12)

plot(day,temp,'r-','linewidth',2);

plot(day,temp,'ko','linewidth',2);

xlabel('Day')

ylabel('Temperature (\circ F)')

title('Temperature for January 2015')

... and so on. I'm surprised I typed that much before I got bored. I'm assuming you don't actually need dlmwrite().

If you want to go over basics, see MATLAB Onramp:

https://matlabacademy.mathworks.com/?page=1&sort=featured

If you don't have a copy of MATLAB, you should be able to use MATLAB Online on a time-limited basis per month for free.

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PLOTING DATA INTO GRAPHICS

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