diary-2008-02-14


lect7_spec



plot(x,y)

lect7_spec
[month total]=loan(25000,7.5,4)

month =

        600.72


total =

      28834.47

a=70000;
b=6.5;
[x y]=loan(a,b,30)

x =

        440.06


y =

     158423.02

help loan
  loan calculates monthly and total payment of a loan.
  Input arguments:
    amount   loan amount in $
    rate     annual interest rate in percent
    years    number of years
  Output arguments:
    mpay     monthly payment
    tpay     total payment
  Author: Alan Usas, 2/9/08

Example7_1(6)

ans =

          4.54

x=1:2:11

x =

  Column 1

          1.00

  Column 2

          3.00

  Column 3

          5.00

  Column 4

          7.00

  Column 5

          9.00

  Column 6

         11.00

Example7_1(x)

ans =

  Column 1

          0.71

  Column 2

          3.03

  Column 3

          4.13

  Column 4

          4.90

  Column 5

          5.52

  Column 6

          6.06

Example7_1([1:2:11])

ans =

  Columns 1 through 2

          0.71          3.03

  Columns 3 through 4

          4.13          4.90

  Columns 5 through 6

          5.52          6.06


Ex7_2

The change in the area is 0.01346 square meters.

FA=@(x) exp(x^2)/sqrt(x^2+5)

FA = 

    @(x)exp(x^2)/sqrt(x^2+5)

FA(2)

ans =

         18.20

z=FA(3)

z =

       2165.64

FA=@(x) exp(x.^2)/sqrt(x.^2+5)

FA = 

    @(x)exp(x.^2)/sqrt(x.^2+5)

FA([1 0.5 2])

ans =

          8.56

FA=@(x) exp(x.^2)./sqrt(x.^2+5)

FA = 

    @(x)exp(x.^2)./sqrt(x.^2+5)

FA([1 0.5 2])

ans =

          1.11          0.56         18.20

HA=@(x,y)2*x^2-4*x*y+y^2

HA = 

    @(x,y)2*x^2-4*x*y+y^2

HA(2,3)

ans =

         -7.00


lect7_1

d = 

    @(rA,thetaA,rB,thetaB)sqrt(rA^2+rB^2-2*rA*rB*cos(thetaB-thetaA))

distAtoB=d(2,pi/6,5,3*pi/4)

distAtoB =

          5.85