Matlab编程与工程应用〔第二版习题解答第一章：MATLAB简介1.>> myage = 25;>> myage = myage - 1;>> myage = myage + 2;2.>> myage = 25;>> myage = myage - 1;>> myage = myage + 2;3.>> namelengthmaxans =634.>> format bank>> 1/3ans =0.335.>> format rat>> 5/6 + 2/7ans =47/426.25 19 4.3333 9 97.>> pounds = 100;>> kilos = 2.2 * poundskilos =220.00008.>> R1 = 20; R2 = 30; R3 = 40;>> RT = <R1\1 + R2\1 + R3\1>\1RT =9.23089.>> ftemp = 90;>> ctemp = <ftemp - 32> * 5 / 9ctemp =32.222210. 略11．>> sind<90>ans =112.>> sita = 2 * pi / 3;>> r = 2;>> x = r * cos<sita>x =-1.0000>> y = r * sin<sita>y =1.732113．>> t = 100;V = 50;>> wcf = 35.7 + 0.6 * t - 35.7 + 0.16 * V + 0.43 * t * 0.16 * Vwcf =41214.Fix<3.5> = 3; Floor<3.5> = 3;Fix<3.4> = 3; Fix<-3.4> = -3;Fix<3.2> = 3; Floor<3.2> = 3;Fix<-3.2> = -3; Floor<-3.2> = -4;Fix<-3.2> = -3; Ceil<-3.2> = -3;15.Sqrt<19>3 ^ 1.2Tan<pi>16.Intmin<‘int32’>; intmax<‘int32’>; intmin<‘int64’>;intmax<‘int64’>;17.Realmin<‘double’>; Realmax<‘double’>;18.>> DblNum = 33.8;>> int32Num = int32<DblNum>int32Num =3419.>> A1 = rand;A2 = 20*rand;A3 = 30 * rand + 20;A4 = round<rand * 10>;A5 = round<rand * 11>; /A6 = round<rand * 50> + 50;>> A4 = randi<10>;>> A5 = randi<11>;>> A6 = randi<50> + 50;20. 略21.Double〔‘A’ < Double<‘a’>; 所以大写在前,小写在后；22.>> CharNum = 'xyz';>> CharNum = char<CharNum - 2>CharNum =vwx23.>> vec = [3 : 1 : 6]vec =3 4 5 6>> vec2 = [1.0000:0.5000:3.0000]vec2 =1.0000 1.50002.0000 2.50003.0000>> vec3 = [5 : -1 :2]vec3 =5 4 3 224.>> vec1 = linspace<4,8,3>vec1 =4 6 8>> vec2 = linspace<-3,-15,5>vec2 =-3 -6 -9 -12 -15>> vec3 = linspace<9,5,3>vec3 =9 7 525．>> vec = [1 : 1 : 10]vec =1 2 3 4 5 6 7 8 9 10 >> vec = linspace<1,10,10>vec =1 2 3 4 5 6 7 8 9 10 >> vec2 = [2:5:12]vec2 =2 7 12>> vec = linspace<2,12,3>vec =2 7 12>> myend = randi<4> + 8;>> vec1 = [1 : 3 : myend]vec1 =1 4 7 1027.>> vec = [-1:0.2:1]'vec =-1.0000-0.8000-0.6000-0.4000-0.20000.20000.40000.60000.80001.000028.>> vec = [0 : 1 : 15];>> n = [1 : 2 : numel<vec> - 1];>> vec2 = vec<n>vec2 =0 2 4 6 8 10 12 14 29.function [a b] = PI_CONT<x>%UNTITLED Summary of this function goes here% Detailed explanation goes heren =1 : 1 : fix<numel<x> / 2>;a = x<n>;n = 1+fix<numel<x>/2> : 1 : numel<x>;b = x<n>;endrem<numel<vec>,2>30．rand<2,3>10*rand<2,3>5 + round<15 * rand<2,3>>randint<2,3,[5 15]>31.rows = randi<5>;cols = randi<5>;y = zeros<rows,cols>;>> mat = [ 7 8 9 1012 10 8 6];>> A1 = mat<1,3>>> A2 = mat<2,:>>> A3 = mat<:,1:2>33.>> mymat = [2 3 4;5 6 7]>> mymat1 = fliplr<mymat>>> mymat2 = flipud<mymat>>> mymat3 = rot90<mymat>34.>> mymatzero = zeros<4,2>>> mymatzero<2,:> = [3,6]35.>> x = linspace<-pi,pi,20>;>> y = sin<x>;36.>> randmat = randint<3,5,[-5 5]> >> sign<randmat>37.>> randmat = randint<4,6,[-5 5]>;>> randmat2 = abs<randmat> 38.>> randmat = rand<3,5>>> randmat<3,:> = []39.>> vec = 1 : 1:1000;>> vec<end>>> vec<numel<vec>>>> [a b ] = size<vec>;>> vec<a * b>40.同上41.>> mat = zeros<3,5>;>> mat<:,:,1> = zeros<3,5>;>> mat<:,:,2> = zeros<3,5>; 42.>> myc = clock>> today = myc<1:3>>> now = myc<4:6>>> now = fix<now>第二章 MATLAB程序设计概述1.ri = 2; % Radius internalro = 4; % Radius outerV = 4 * pi / 3 * <ro ^ 3 - ri ^ 3> % calculate volume2.% Calculate Atomic Weight H2O2Weight_O = 15.9994;Weight_H = 1.0079;AtomicWeight = Weight_O * 2 + Weight_H * 2 % Calculate H2O2 Atomic Weight 3.fprintf<'Length of The character string is : %d\n',…length<input<'Please input character string :\n','s'>>>;4.NewNumber = input<'please input a Number :\n'>;fprintf<'Number with 2 decimal is :%0.2f\n',NewNumber>;5.>> vec = input<'Enter a matrix: '>Enter a matrix: [1:1:10;1:1:10]6.>> fprintf<'OUTPUT : %f\n',12345.6789>OUTPUT : 12345.678900>> fprintf<'OUTPUT : %10.4f\n',12345.6789>OUTPUT : 12345.6789>> fprintf<'OUTPUT : %10.2f\n',12345.6789>OUTPUT : 12345.68>> fprintf<'OUTPUT : %6.4f\n',12345.6789>OUTPUT : 12345.6789>> fprintf<'OUTPUT : %2.4f\n',12345.6789>OUTPUT : 12345.67897.>> fprintf<'OUTPUT : %d\n',12345>OUTPUT : 12345>> fprintf<'OUTPUT : %5d\n',12345>OUTPUT : 12345>> fprintf<'OUTPUT : %8d\n',12345>OUTPUT : 12345>> fprintf<'OUTPUT : %3d\n',12345>OUTPUT : 123458.>> x = 12.34;>> y = 4.56;>> fprintf<'x is %.3f\n',x>x is 12.340>> fprintf<'x is %0.0f\n',x>x is 12>> fprintf<'y is %0.1f\n',y>y is 4.6>> fprintf<'y is %0.1f !\n',y>y is 4.6 !9.% Calculate Area of the squarenessfprintf<'The Area of The Squareness is %.2f',…<input<'Please input the Length of the Squareness \n'>> …* <input<'Please input the Width of the Squareness \n'>>>;10.NewName = input<'What is your name? ','s'>;fprintf<'Wow,your name is %s!\n',NewName>;11.NewString = input<'Enter your string : ','s'>;fprintf<'Your String was : ''%s''\n',NewString>;12.WaterSpeed = input<'Enter the folw in m^3/s : '>;WaterSpeedft = 0.028 \ WaterSpeed;fprintf<'A flow rate of %.3f meters per sec \n',WaterSpeed>;fprintf<'is equivalent to %.3f feet per sec\n',WaterSpeedft>;13.IncomeY = input<'Input your income every year?'>;FoodCostY= [IncomeY * 8 / 100 IncomeY*10 / 100];FoodCostM = 12\FoodCostY;fprintf<'Food Cost in every year is %.2f - %.2f\n',FoodCostY<1>,FoodCostY<2>>; fprintf<'Food Cost in every Month is %.2f - %.2f\n',FoodCostM<1>,FoodCostM<2>>;14.Weight = input<'Please input the Weight of the plan \n'>Area = input<'Please input the area of the plan wing \n'>fprintf<'Charge of Plan Win is %.2f \n',Weight / Area>15.x = 10;y = 10;plot<x,y,'g+'>;16.clfx = -2 : 0.1 : 2;y = exp<x>;plot<x,y,'g'>;xlabel<'X'>;ylabel<'Y'>;legend<'Exp<x>'>;Title<'Exp Example'>;17.clfx = 1 : 5 : 100;y = sqrt<x>;plot<x,y,'go'>;hold on;bar<x,y>;18.clfy = randint<1,100,[0 100]>;x = 1 : 1 : length<y>;plot<x,y,'ro'>;hold onplot<x,y,'g+'>;figure<2>;plot<x,y,'k'>;figure<3>;bar<x,y>19.clfx = linspace<0,pi,10>;y = sin<x>;plot<x,y,'r'>;figure<2>;x = linspace<0,pi,100>;y = sin<x>;plot<x,y,'b'>;20.load TimeTemp.datx = TimeTemp<:,1>';y = TimeTemp<:,2>';plot<x,y>;Xlabel<'Height'>;Ylabel<'Temperature'>;Title<'Height - Temperature'>;legend<'TEMP'>21.>> randint<3,6,[50 100]>;>> save RandInt.bat ans -ascii;>> randint<2,6,[50 100]>>> save RandInt.bat randint -ascii –append >> load RandInt.bat>> RandInt22.>> load testtan.bat>> tan<testtan>23.>> load hightemp.dat>> hightemp<:,1> = hightemp<:,1> .+ 1900>> save y2ktemp.dat hightemp –ascii24.function [ fn ] = fn< x >%Calculate y as a function of xfn = x^3 - 4 * x^2 + sin<x>;end25.function [ mwh] = mwh_to_gj<x>%convers from MWh to GJmwh = 3.6 * x;end26.function [ output_args ] = miletometer< x >%Conver mile to meterMile = input<'mile per hours number :'>;meter = Mile * 5280 * 0.3048 / 3600;output_args = meter;fprintf<'Meter of the mile is : % .2f',meter>; end27.function [ Tn ] = Interest< p,i,n >%UNTITLED4 Summary of this function goes hereTn = p * <1 + i> * n;end28.略29.function [ V ] = SpeedConv<pi,ps>%UNTITLED4 Summary of this function goes hereV = 1.016 * sqrt<pi - ps>end30. function [ THR ] =Cal_rate<A>%UNTITLED4 Summary of this function goes hereTHR = <220 - A> * 0.6;end31.function [ nJ ] =STL_calc<n>%UNTITLED4 Summary of this function goes herenJ = sqrt<2 * pi * n> * <n / exp<1>>^n;end32.function [ output_args ] = costn< n >%UNTITLED5 Summary of this function goes hereoutput_args = 5 * n ^ 2 - 44 * n + 11;endn = input<'Enter the number of units :'>;Cn = costn<n>;fprintf<'The cost for 100 units will be $%.2f\n',Cn>;33.略〔仿造32题34.function [ V ] = oblong< length >%UNTITLED8 Summary of this function goes hereV = 1/12*sqrt<2>*length^3;endfprintf<'The volume of oblong is : %.2f\n ',oblong<input<'Enter the length of the oblong:\n'>>>35.function [ y ] = pickone< x >%pickone<x> returns a random element from vector xn = length<x>;y = x<randi<n>>;end36.function [ y ] = vecout< x >%UNTITLED11 Summary of this function goes herey = x : 1 : x+5;end37.b = input<'Enter the first side :'>;c = input<'Enter the second side :'>afa = input<'Enter the angle between them :'>y = sqrt<b^2 + c^2 - 2*b*c*cos<afa *<pi/180>>>;fprintf<'The third side is %.3f\n',y>;38.略39.load floatnums.datfloatnums = round<floatnums>;floatnums = floatnums';save intnums.datfloatnums-ascii;40.load costssales.datn = length<costssales<:,1>>;fprintf<'There were %d quarters in the file ',n>;n = 1 : 1 : n;costs = costssales<:,1>;sales = costssales<:,1>;plot<n,costs,'ko'>;hold onplot<n,sales,'b*'>;legend<'COSTS','SALES'>;xlabel<'COST'>;ylabel<'SALE'>;title<'COST-SALE'>;costssales = costssales'costssales = flipud<costssales>;save newfile.datcostssales-ascii;第三章选择语句2. if <input<'please Enter a x :\n','s'> ~= 'x'>disp<'sorry the char not x'>;end3. function y = Test3<x>if <x == 12>y = 1;elsey = x + 1;end;4. disp<'The program will calculate the volume of a pyramid'>;a = input<'Enter the length of the base :'>;c = input<'Is that i or c?','s'>;if< c == 'c'>a = a/2.54;end;b = input<'Enter the width of the base :','s'>;c = input<'Is that i or c?'>;if< c == 'c'>b = b/2.54;end;d = input<'Enter the length of the base :','s'>;c = input<'Is that i or c?'>;if< c == 'c'>d = d/2.54;end;fprintf<'The Volume of the Pyramid is %.3f cubic inches.',a * b * d / 3>;5.if<input<'Are you an engineer?<Y/N>','s'> == 'Y'>disp<'You are the best!'>;elsedisp<'oh~ soga'>;end;6.Fenzi = input<'Please input enter the FENZI: '>;Fenmu = input<'Please input enter the FENMU: '>;if<Fenmu == 0>disp<'Sorry The Fenmu can not be zero!'>;elsefprintf<'The result is %.2f.\n',Fenzi/Fenmu>;end;7.function Result = Test3_Func< a,b >%TEST3_FUNC Summary of this function goes here% Detailed explanation goes hereResult = sqrt<1 - b^2/a>;EndFunction:a = input<'Please Enter the a : '>;b = input<'Please Enter the b : '>;if <a == 0>disp<'Error 0001'>;elsefprintf<'The Result is %.2f \n',Test3_Func<a,b>>;end;8.a = input<'Please Enter the Shousuo : '>;b = input<'Please Enter the Shuzhang : '>;if <a<120 && b<80>disp<'you are the best choice !'>;elsedisp<'Sorry you can not do this!'>;end;9.A1 = input<'Enter the First Area: '>;A2 = input<'Enter the Second Area: '>;if<A1 > A2>disp<'UP!'>;elseif <A1 < A2>disp<'Down!'>;elsedisp<'Keep!'>;en10.a = input<'Enter the PH number : '>;if <a < 7>disp<'Suan'>;elseif <a > 7>disp<'Jian'>;elsedisp<'Zhong'>;end;11.function Result = Test3_Func< a,b >%TEST3_FUNC Summary of this function goes here % Detailed explanation goes hereif <a < b>Result = a : 1 : b;elseResult = a : -1 : b;end12.function Result = Test3_Func< x >%TEST3_FUNC Summary of this function goes here % Detailed explanation goes here[a b] = size<x>;if <<a ~= 1 && b ~= 1> || <a == 1 && b == 1>> Result = x;elseif<a == 1>Result = fliplr<x>;elseResult = flipud<x>;end13.letter = input<'Enter your answer :','s'>;if <letter == 'Y' || letter == 'y'>disp<'OK,continuing'>;elseif<letter == 'N' || letter == 'n'>disp<'OK,halting'>;elsedisp<'Error'>;end14.switch lettercase {'Y''y'}disp<'OK,contining'>case {'N''n'}disp<'OK,halting'>otherwisedisp<'Error'>end15.Mahe = input<'Enter the Speed of Plan : '>/input<'Enter the Speed of Voice: '>; if<Mahe > 1>disp<'supersonic speed'>;elseif<Mahe < 1>disp<'subsonic speed'>;elsedisp<'transonic speed'>;end;16.X = input<'Enter the temp in degrees C : \n'>;switch <input<'Do you want F or K?','s'>>case'F'fprintf<'The temp in degrees F is %.1f',<9/5>*X + 32>;case'K'fprintf<'The temp in degrees K is %.1f',X + 273.15>;otherwisedisp<'Enter Error!'>;end;17.%function y = Test3<x>X = randi<100>;if rem<X,2> == 0fprintf<'%d ÊÇżÊý\n',X>;elsefprintf<'%d ÊÇÆæÊý\n',X>;end18.function y = Test3<x>switch rem<x,4>case 0y = true;otherwisey =false;end;19.function y = Test3<innum>if innum == int32<innum>y = true;elsey =false;end;20.function y = Test3<a,b,c>if a^2 == b^2 + c^2y = true;elsey =false;end;21.Re = input<'Enter the Re Value :\n'>;if Re <= 2300 disp<'Laminar region'>;elseif Re > 2300 && Re <= 4000 disp<'Transition region'>; else disp<'Turbulent region'>;end;22.d1 = input<'Enter d1 : \n'>;d2 = input<'Enter d2 : \n'>;if d1 <= 0 || d2 <= 0disp<'Error!'>;elsefprintf<'%.2f',Test3_Func<d1,d2>>;end;function y = Test3_Func<a,b>y = a * b / 2;23.V = input<'Enter the speed of the wing: '>;if V <= 38 disp<'tropical depression '>;elseif V >= 73 disp<'typhoon'>;else disp<'revolving storm'>;end;24.V = input<'Enter the speed of the wing :'>;if V >74 && V <= 95disp<'1 : 4-5'>;elseif V > 95 && V <= 110disp<'2 : 6-8'>;elseif V > 110 && V <= 130disp<'3 : 9-12'>;elseif V > 130 && V <= 155disp<'4 : 13-18'>;elseif V > 155disp<'5 : 18'>;elsedisp<'Error'>;end25.略26.H = input<'Enter the hight of the cloude :'>;if H < 6500 && H > 0disp<'Low'>;elseif H >= 6500 && H < 20000disp<'Middle'>;elsedisp<'High'>;27.if letter == 'x'disp<'Hello'>;elseif letter == 'y'||letter == 'Y'disp<'Yes'>;elseif letter == 'Q'disp<'Quit'>;elsedisp<'Error'>;end;28.switch numcase {0 1 2}f2<num>;case {-2 -1}f3<num>;case 3f4<num>;otherwisef1<num>;end;29.switch menu<'menu','1.Cylinder','2.Circle','3.Rectangle'>case 1R = input<'Please enter the radius of buttom circle:'>;H = input<'Enter the height of the Cylinder:'>;A = 2 * pi * R * H + 2 * pi * <R ^ 2>;fprintf<'The area is %.2f',A>;case 2R = input<'Please enter the radius of circle:'>;A = pi * <R ^ 2>;fprintf<'The area is %.2f',A>;case 3a = input<'Please enter the long of Rectangle:'>;b = input<'Please enter the with of Rectangle :'>;A = a * b;fprintf<'The area is %.2f',A>;end30.同2931.同2932.x = input<'Enter the Value X :'>;Y = menu<'Menue Choose','Sin','Cos','Tan'>;switch Ycase 1output = sin<x>;case 2output = cos<x>;case 3output = tan<x>;end;33.略34.function output = Test3_Func<x>Y = menu<'Menue Choose','ceil','round','sign'>;switch Ycase 1output = ceil<x>;case 2output = round<x>;case 3output = sign<x>;end;35.略36.略37.略第四章循环1.>> for i = 1.5:0.2:3.1i = iend2.function output = Test3_Func<x>x = x - <rem<x,2> == 0>;output = 0;for i = 1 : 2 : xoutput = output + i;end;3.function output = Test3_Func<x>x = x - <rem<x,2> == 0>;output = 1;for i = 1 : 2 : xoutput = output * i;end;4.5.>> for i = 32 : 1 : 255char<i>end;6.>> vec = [5.5 11 3.45];>> for i = 1 : length<vec>fprintf<'Element %d is %.2f .\n',i,vec<i>>;end;7.n = randi<4> + 1;sum = 0;for i = 1 : nsum = sum + input<'Enter the value'>;end;fprintf<'Sum = %.1f\n',sum>;8disp<'Please enter the threshold below which samples will be considered to be invalid :'>;Value1 = input<'Considered to be invalid :\n'>;Value2 = input<'Please enter the number of data samples to be entered :\n'>; Sum = 0;num = 0;for i = 1:Value2data = input<'Please enter a data sample :'>;if data > Value1Sum = Sum + data;num = num + 1;endendif num == 0disp<'Data Error !'>;elsefprintf<'The average of the %d valid data samples is %.2f volts.',num,Sum/num>; end9.load MaxTemp.mat[a b] = size<MaxTemp>;for i = 1 : a;Matix1 = zeros<size<MaxTemp>>;Matix1<i,:> = MaxTemp<i,:>end10.sum = 0;for i = 1 : length<pipe>sum = sum + <pipe<i,1> < 2.1 || pipe<i,1> > 2.3>;sum = sum + <pipe<i,2> < 10.3 || pipe<i,2> > 10.4>;endfprintf<'There were %d rejects.\n',sum>;11.略12.略13.x = randint<1,5,[-10,10]>;x2 = 0;for i = 1 : length<x>x1<1,i> = x<1,i> - 3;if x1<1,i> > 0x2 = x2 + 1;end;x3<1,i> = abs<x1<1,i>>;if i > 1x4 = max<x1<1,i>,x1<1,i-1>>;end;end16.17.略18.19.20.略22.略23.略24.10略略第五章向量化代码1.Mat.*2;2.Result = vec;3.cumprod<vec>;4.>> vec = randint<1,6,[0 20]>;>> maxvec = max<vec>;>> minvec = min<vec>;>> cumsumvec = cumsum<vec>5.Sum<vec>6.>> clear>> vec = randint<1,5,[-10 10]>;>> vec_3 = vec - 3;>> ZhengshuNum = length<find<vec > 0>>;>> vec_abs = abs<vec>;>> vec_max = max<vec>;7.max<vec,[],1>max<vec,[],2>max<max<vec>>;8.function output = Test3_Func<r,n>vec = [];for i = 0 : nvec = [vec r.^i];end;output = sum<vec>;>> vec1 = Vec<[1 3 5]>;>> vec2 = Vec<[2 4 6]>;>> CheckSum = vec1.*vec2;11.>> vec = 1 : 1 : 1000;>> Result = sum<1./<vec.^2>>;>> Check = pi.^2/6;>> diff = check – result13.略14.略15.clear;clf;vec_temp = 0 : 0.5 : 10;x1 = input<'Enter the number of level :'>;while<all<vec_temp - x1>>x1 = input<'Enter the number of level :'>;end;disp<x1>16.略17.ticif x==21disp<x>end;tocticswitch xcase 21disp <x>;end;toc18.Ones<3>19.If find<r > 0> == [] && fin<h > 0> == 0V = pi .*<r.^2>*hEnd;第六章 MATLAB 程序1~20 略21.function S = Test3_Func<n>P = 10000;i = 0.05;vec = 1 : 1 : n;S = P * <<1 + i>.^vec>;plot<vec,S>;n = input<'Enter the Year:'>;while ~<n >0 && int32<n> == n>n = input<'Enter the Year:'>;end;Test3_Func<n>;22.Function lenf = lenprompt<>;Lenf = input<‘Enter the length By inches: ’>; Function Leni = covert_f_to_i<lenf>Leni = …<英尺转英寸>Function printlens<lenf,leni>Disp<lenf>;Disp<leni>;23.略24.。
