东南大学Matlab作业1

Matlab Worksheet 1

Part A

Get into Matlab: Use the diary command to record your activity in to a file: diary mydiary01.doc before you start your work. (And diary off to switch off your diary when you finish your work.)

At the Command Window assign a value x=10, then use the Up Key ↑ to repeat the expression, editing it to show the effect of using a semicolon after the 10, namely x=10;

Answers:

>> x=10

x =

10

>> x=10;

Confirm whether the following names of variables are acceptable:

VelocityYes No

Velocity1Yes No

c) Velocity.1Yes No

Velocity_1Yes No

Velocity-01Yes No

velocityONEYes No

g) 1velocityYes No

Answers: (1)legal variable names : a) Velocity

b) Velocity1

d) Velocity_1

f) velocityONE

(2) illegal variable names: c) Velocity.1

e) Velocity-01

g) 1velocity

Assign two scalar variables x and y values x=1.5, y=2.3, then construct Matlab expressions for the following:

a) b) c)

Answers:

the result of the Command Window is:

>> x=1.5;y=2.3 ;

z1=5*x^3*y/(x+y)

z2=(x^7*y^0.5)^(2/3)

z3=(x^(1/6)/(log10(x^5-1))+1)*exp(-2*y)

z4=sin(2*pi*x-y)+exp(x).*cos(2*pi*x)

z1 =

10.2138

z2 =

8.7566

z3 =

0.0232

z4 =

-3.7360

Assign two variables with complex values u=2+3j and v=4+10j and then construct expression for:

b) c) d)

Answers:

the result of the Command Window is:

>> u=2+3j;v=4+10j;

z1=u/v

z2=u*v+2j

z3=u/2j

z4=v*exp(-j*2*pi*u)

z1 =

0.3276 - 0.0690i

z2 =

-22.0000 +34.0000i

z3 =

1.5000 - 1.0000i

z4 =

6.1421e+08 + 1.5355e+09i

Use the colon operator : to assign numerical values between 0 and 1 to vector array variable a in steps of 0.1.

Answer:

the result of the Command Window is:

>> V=0:0.1:1

V =

Columns 1 through 10

0 0.1000 0.2000 0.3000 0.4000 0.5000 0.6000 0.7000 0.8000 0.9000

Column 11

1.0000

Use linspace function to assign 20 values to vector variable y betw