东南大学Matlab作业1.docVIP

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: Velocity Yes No Velocity1 Yes No c) Velocity.1 Yes No Velocity_1 Yes No Velocity-01 Yes No velocityONE Yes No g) 1velocity Yes 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 between 20 and