matlab实验一、二.doc

X=magic(3)X = 8 1 6 3 5 7 4 9 2 K=eye(3)K = 1 0 0 0 1 0 0 0 1 L=zeros(3)L = 0 0 0 0 0 0 0 0 0 M=ones(3)M = 1 1 1 1 1 1 1 1 1 Y=(1 2 3;4 5 6;7 8 9)? Y=(1 2 3;4 5 6;7 8 9) |Error: Unexpected MATLAB expression. Y=1 2 3;4 5 6;7 8 9Y = 1 2 3 4 5 6 7 8 9 Z=zeros(4,5)Z = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 A=magic(4)A = 16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1 A1=zeros(size(A)A1 = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 B=rand(5)B = 0.8147 0.0975 0.1576 0.1419 0.6557 0.9058 0.2785 0.9706 0.4218 0.0357 0.1270 0.5469 0.9572 0.9157 0.8491 0.9134 0.9575 0.4854 0.7922 0.9340 0.6324 0.9649 0.8003 0.9595 0.6787 n=find(B B(n)=B(n)+1B = 0.8147 1.0975 1.1576 1.1419 0.6557 0.9058 1.2785 0.9706 0.4218 1.0357 1.1270 0.5469 0.9572 0.9157 0.8491 0.9134 0.9575 0.4854 0.7922 0.9340 0.6324 0.9649 0.8003 0.9595 0.6787 C1=B(1:2:end,:)C1 = 0.8147 1.0975 1.1576 1.1419 0.6557 1.1270 0.5469 0.9572 0.9157 0.8491 0.6324 0.9649 0.8003 0.9595 0.6787 C2=B(3,2,1,2,3,4)C2 = 0.5469 0.9572 0.9157 1.2785 0.9706 0.4218 1.0975 1.1576 1.1419 X+Yans = 9 3 9 7 10 13 11 17 11 X-Yans = 7 -1 3 -1 0 1 -3 1 -7 X*Yans = 54 69 84 72 87 102 54 69 84 X/YWarning: Matrix is singular to working precision.ans = NaN Inf -Inf NaN -Inf Inf NaN -Inf Inf XYans = 0.0167 0.0833 0.1500 0.7667 0.8333 0.9000 0.0167 0.0833 0.1500 K/YWarning: Matrix is singular to working precision.ans = NaN Inf -Inf NaN -Inf Inf NaN Inf -Inf X/MWarning: Matrix is singular to working precision.ans = Inf NaN NaN -Inf NaN NaN Inf NaN NaN d=X/YWarning: Matrix is singular to working precision.d = NaN Inf -Inf NaN -Inf Inf NaN -Inf Inf d=(X-1)*Yd = 0.0167 0.0833 0.1500 0.7667 0.8333 0.9000 0.0167 0.0833 0.1500 X*(Y-1)Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.541976e-018.ans = 1.0e+017 * -0.5404 1.0809 -0.5404 0.0000 0 0 0.5404 -1.0809 0.5404(X=Y).*Xans = 8 0 6 0 5 7 0 9 0 p=3,4.2,0,-5,-6.8,5p = 3.0000 4.2000 0 -5.0000 -6.8000 5.0000 x=roots(p)x = -1.5771 -0.6897 + 1.1756i -0.6897 - 1.1756i 0.9705 0.5861 x=1:1:30x = Columns 1 through 13 1 2 3 4 5 6 7 8 9 10 11 12 13 Columns 14 through 26 14 15 16 17 18 19 20 21 22 23 24 25 26 Columns 27 through 30 27 28 29 30 y=polyval(p,x)y = 1.0e+007 * Columns 1 through 7 0.0000 0.0000 0.0001 0.0004 0.0012 0.0029 0.0060 Columns 8 through 14 0.0115 0.0204 0.0341 0.0544 0.0833 0.1233 0.1774 Columns 15 through 21 0.2490 0.3420 0.4609 0.6108 0.7974 1.0270 1.3067 Columns 22 through 28 1.6442 2.0482 2.5278 3.0934 3.7560 4.5275 5.4209 Columns 29 through 30 6.4500 7.6297 plot(x,y)实验一 Warning: Could not get change notification handle for local C:ProgramFilesMATLABR2007bwork.Performance degradation may occur due to on-disk directory change checking. help sqrt SQRT Square root. SQRT(X) is the square root of the elements of X. Complex results are produced if X is not positive. See also sqrtm, realsqrt, hypot. Overloaded methods: darray/sqrt sym/sqrt Reference page in Help browser doc sqrt clear a1=5a1 = 5 a2=3+5ia2 = 3.0000 + 5.0000i b1=linspace(3,8,20)b1 = Columns 1 through 9 3.0000 3.2632 3.5263 3.7895 4.0526 4.3158 4.5789 4.8421 5.1053 Columns 10 through 18 5.3684 5.6316 5.8947 6.1579 6.4211 6.6842 6.9474 7.2105 7.4737 Columns 19 through 20 7.7368 8.0000 b2=1:0.3:6.9b2 = Columns 1 through 9 1.0000 1.3000 1.6000 1.9000 2.2000 2.5000 2.8000 3.1000 3.4000 Columns 10 through 18 3.7000 4.0000 4.3000 4.6000 4.9000 5.2000 5.5000 5.8000 6.1000 Columns 19 through 20 6.4000 6.7000 b3=1,2,3,4;2,2,3,4;3,2,3,4;4,2,3,4b3 = 1 2 3 4 2 2 3 4 3 2 3 4 4 2 3 4 pians = 3.1416 format long pians = 3.141592653589793 a1_s=sqrt(a1)a1_s = 2.236067977499790 a2_a=abs(a2)a2_a = 5.830951894845301 who Your variables are:a1 a1_s a2 a2_a ans b1 b2 b3 whos Name Size Bytes Class Attributes a1 1x1 8 double a1_s 1x1 8 double a2 1x1 16 double complex a2_a 1x1 8 double ans 1x1 8 double b1 1x2