4rth semester matlab assignment solved 70 question
DESCRIPTION
solved questionsTRANSCRIPT
QUESTION: 1
Run the MATLAB code:a = 1:5; d = a + i * a; e = d' f = d.'Ans: >> a=1:5;>> d=a+i*a;>> e=d'e =1.0000 - 1.0000i2.0000 - 2.0000i3.0000 - 3.0000i4.0000 - 4.0000i5.0000 - 5.0000i>> f=d.'f =1.0000 + 1.0000i2.0000 + 2.0000i3.0000 + 3.0000i4.0000 + 4.0000i5.0000 + 5.0000iQUESTION: 3a = [1 2 3 4 ; 5 6 7 8 ; 9 10 11 12 ; 13 14 15 16]a = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
>> x = [ -5 -10 -15]x = -5 -10 -15
>>diagElement = diag (a)diagElement = 1 6 1116>>diagMatrix = diag (diag (a))diagMatrix = 1 0 0 0 0 6 0 0 0 0 11 0 0 0 0 16
QUESTION: 2 Given A =
1 2 41 1 12 3 1
and B =2 2 22 2 22 2 2Run the MATLAB code:Greater = A > BGreaterThanOne = A > 1
Ans:>> a = [1 2 4 ; 1 1 1 ; 2 3 1]a = 1 2 4 1 1 1 2 3 1b = [2 2 2 ; 2 2 2 ; 2 2 2]b = 2 2 2 2 2 2 2 2 2
greater = a > bgreater = 0 0 1 0 0 0 0 1 0
>>greaterThanOne = a > 1greaterThanOne = 0 1 1 0 0 0 1 1 0
QUESTION: 4Find a way to delete zeros from the vector x.
x = [0 6 0 7 3 0 3 0 2 2]x = 0 6 0 7 3 0 3 0 2 2>>x(x==0) = []x = 6 7 3 3 2 2
>>Dmatrix = diag (x)Dmatrix = -5 0 0 0 -10 0 0 0 -15
>>SuperdiagElement = diag (a,2)
SuperdiagElement = 3
QUESTION: 6Ans:>>name = upper('matlab')name =MATLAB
>>fun = strrep('hahahahahahahahahahahahahahahahaha','a','i')fun =hihihihihihihihihihihihihihihihihi
>> greet = 'Welcome'greet =Welcome
>>where = 'to Joan''s'where =to Joan's>>party = 'birthday party'party =birthday party>>final = str2mat(greet, where, party)final =Welcome to Joan's birthday party>>text = 'Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday'text =Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday>> [day,rest] = strtok(text, ',')day =Mondayrest =, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday>> [day2,rest] = strtok(rest, ',')day2 = Tuesdayrest =, Wednesday, Thursday, Friday, Saturday, Sunday
QUESTION: 5
Run the MATLAB code: x = [1/4 1 sqrt(2) .3]; y = sin(x); plot(y)
>> x = [1/4 sqrt(2) 3]x = 0.2500 1.4142 3.0000>> y = sin(x)y = 0.2474 0.9878 0.1411>> plot(y)
QUESTION: 7 The MATLAB code text(x,y,'alpha')Places the letter alpha at position (x, y). Write the text ‘\Graph of e-xsin 'at (.5, .2)
>> x=0:pi/40:2*pi;>> y=sin(x);>> plot(x,y)>> text(0.5,0.2,'graph of e^{-x}sin\phi')
QUESTION: 8Ans:>> A=[1 1;2 2;3 3;4 100] 1 1 2 2 3 3 4 100>> Average=mean(A)Average =2.5000 26.5000>> Med=median(A)Med = 2.5000 2.5000>> Dev=std(A)Dev =1.2910 49.0068
QUESTION: 9Ans:
>> A=[0 4 4;2 0 2;4 2 0];>> [Asend,Ind]=sort(A)
Asend = 0 0 0 2 2 2 4 4 4
Ind = 1 2 3
2 3 2 3 1 1 >> Decend=flipud(sort(A))
Decend = 4 4 4
2 2 2 0 0 0
QUESTION: 10Ans:
function [s] = sinm(x) s=sin(x)-2.*x+2;
endOn command window
>> sinm_2(0:2*pi/40:2*pi);>> fplot('sinm_2',[-10 10])
>> grid on>> title('the function sin(x)-2.*x+2')>> xzero=fzero('sinm_2',2)
xzero =
1.4987
QUESTION: 15 Ans: >> %Dec2Bin will convert a number to binary equivalent
>> a=dec2bin(34)
a =
100010QUESTION: 16Ans:function [] =etimef(~)ticnum_length=1:100000;tocend
QUESTION: 17 Ans:
>> c=0:20:100;>> %formula for changing degree Celsius into oF.>> F= (9/5)*c+32;>> e=c'
e = 0 20 40 60 80 100
>> g=F' g = 32
68 104 140 176 212>> convert_c_to_F=[e g]convert_c_to_F =
0 32 20 68 40 104 60 140 80 176 100 212(OR)
QUESTION: 17Ans:
function [F,X] =temp(C)C=([0:20:100])';X=9./5.*C+32;F=([X])';fprintf(' C F\n');fprintf(' (degree) (fahrenheight)\n');
fori=1:length(C);fprintf('%8g %16g\n', C(i),F(i));endend
QUESTION: 18. In Europe daylight time starts on the last Sunday of March and ends on the last Sunday of October. Write a function that determines whether a given day number is in the summertime period or in the wintertime period of the Daylight Saving Time
Ans:
function [f]= q18(datetime)
datetime= input('enter the date')[yr,mon,dom,hr]=datevec(datetime);dow=weekday(datetime)-1;f = 'day numer is in summer time';if (mon>4 &mon<10), return; end;if (mon==4 &dom>7), return; end;if (mon==4 &dom<=7 &dow==0 &hr>=2), return; end;if (mon==4 &dom<=7 &dow>0 &dom>dow), return; end;if (mon==10 &dom<25), return; end;if (mon==10 &dom>=25 &dow==0 &hr<2), return; end;if (mon==10 &dom>=25 &dow>0 & dom-24-dow < 1), return; end;f ='day number is in winter time';end
QUESTION: 21
Let be given the string `Need-to-split-this-string'. We want to break it into the -tive strings `Need', `to', `split', `this', and `string'. Solutions may be based on strtok and the much faster strread
Ans:function [parts] =q21( ~ )str='18c'splitstr='[c]';
parts=regexp(str,splitstr,'split');end
QUESTION: 22
We have a string that looks like `18C'. How to keep only the number 18?
Ans:function [Result,N] =q22(~)S='18c'N = sscanf(S, '%d')end
QUESTION: 23We want to save a vector v=[1 2 3 4]; into a text file. How to that?Ans:
V=[1 2 3 4]>> save textfile.m V_ascii
%to save the file>>load textfile.m>>textfiletextfile=1 2 3 4QUESTION: 24
Write a code that removes all 2's in a matrix A
Ans:
function [ new] = q24(matrix )
matrix=input('enter matrix')
new=matrix(matrix==2);endOR>> A=[2 2 6;3 2 6;2 7 4];>> A(A==2)=[]
A = 3 7 6 6 4
QUESTION: 25How can I comment several lines at once in stead of typing the symbol % at the beginning of each line?
Ans:>>if(0)I am a student.My name is Azeem.I want peace.end%The text between if(0) and end will become comments
QUESTION: 26How can I find where the matrix A changes sign?>> A=[1 -6 -4;-7 8 3]; >> S=sign(A)S =
1 -1 -1 -1 1 1
QUESTION: 28Given an array like [2; 8; 3; 30; 4; 50; 100; 200; 4; 80; 500]. I want to split it into three arrays with different ranges: [0-10), [10-100), and [100-1000).The above array should become
2; 8; 3; 4; 4
30; 50; 80
100; 200; 500
How to do this?
Ans:function [split,b ] = q28(~)% Result should look like 1 2 3 4...% 8 9 % 16 17 18 a = [1 2 3 4 8 9 16 17 18];b=a-(1:length(a));b = [true; diff(b(:)) ~= 0; true];split = mat2cell(a(:).', 1, diff(find(b)));
[m , n , o]=split{:}end
QUESTION: 30Is there a convenient way of listing the names of all *.m functions thatare called by a given *.m function?function [] =q30(n )n=input('enetr the name of fuction whose subfuctions names you want to know=')help 'n'end
QUESTION: 31 How can one set the background of a figure view as white?
Ans:
function [] =q31(~)
set(gca,'color','white')whitebg('white')end(OR)>>figure=figure(‘color’,[1 1 1])
QUESTION: 32How can one simulate a curve shaped like a heart by a spline function?Ans:function [] = q32(~)n=100;x=linspace(-3,3,n);y=linspace(-3,3,n);z=linspace(-3,3,n);[X,Y,Z]=ndgrid(x,y,z);F=((-(X.^2) .* (Z.^3) -(9/80).*(Y.^2).*(Z.^3)) + ((X.^2) + (9/4).* (Y.^2) + (Z.^2)-1).^3);isosurface(F,0)lightingphongcaxisaxis equalcolormap('flag');view([55 34])end
QUESTION: 37 I want to index the entries in a matrix by using vectors with row and column indices. How to do that?
Ans:function [ out_args ] =q37( in_args)q=magic(4)q = [16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1]idx = sub2ind(size(q), [2 3 4], [1 2 4])idx = [ 2 7 16]end
QUESTION: 38
function [ output_args ] =q38( input_args ) k=10disp(fprintf('this is the number=%d',k))end
QUESTION: 39. I want to display variable values inside a disp command: \This is number: k". How to do that?
Ans:>> line([1,1],[2,0],'marker','*','color','r','linestyle',':')>> clf>> line([1,1],[2,0],'marker','*','color','r','linestyle',':')>> line([3,1],[2,4],'marker','+','color','g','linestyle','--')>> line([2,2],[3,4],'marker','>','color','b','linestyle','-')>> axis([-5 5 -5 5])
QUESTION: 41function [ output_args ] =q41( input_args )x1=-3:.2:3;x2=-3:.2:3;[X,Y] = meshgrid(x1,x2);f = (X-3).^2 + (Y-3).^2;g = 10.*(X + Y);ix = g >= 4;f(ix)=200;surf(X,Y,f)grid onend
QUESTION: 42How do I create a maximized figure window?function [ output_args ] =q42( input_args )gcf = q41set(gcf,'Units','normalized','Position',[0.00 0.034 1.00 0.905])end(OR)>>h=figure;>>pause (0.1)
>>Jf=get(h,’javaframe’);>>set(Jf, ‘maximized’ ,1);
QUESTION: 43I have to plot a variable number of data sets on the same graph with different symbols. How can I specify the symbols I want to use? How can I specify the order and color of the symbols to be used?
function [ output_args ] = q43( input_args )xlabel({'x red';'x1 green'})ylabel({'y red';'y1 green'})end
QUESTION: 44
function [ output_args ] = q44( input_args )p=[-100:100];q=1:sum(p>=1)p(q)endQUESTION: 45
function [ ] = q45(~)x=-1:.1:1;y=x;[xx,yy]=meshgrid(x,y);zz=(16-xx.^2).^(1/2);mesh(xx,yy,zz)title('The graph of z=(16-x^2)^(1/2)')xlabel('x-axis')ylabel('y-axis')zlabel('z-axis')axis tightend
QUESTION: 46I have a char array '000101'. Is there any way to split this into six separate elements: '0' '0' '0' '1' '0' '1'?
function [parts] =q46( ~ )str='0 0 0 1 0 1'
splitstr=[' '];parts=regexp(str,splitstr,'split');end
QUESTION: 47How can I store strings of variable length? [Hint use cell arrays]
function [ output_args ] = q47( input_args )userinput={'AJ48 NOT'; 'AH43 MANA'; 'AS33 NEWEF'};disp(userinput{1});end
QUESTION: 48function [ output_args ] =q48( input_args )fid = fopen('use.m', 'r')x = fread(fid,inf)end
QUESTION: 50>> x=1:4;>> y=1:10;>> c=find(ismember(x,y))
c =
1 2 3 4
>> %where 1 2 3 4 are inices of matching entries(OR)function [ output_args ] =q50( input_args )a =[2 3 1 2]b=[2 1 7 2]ind=find(a==b)end
QUESTION: 51function [ output_args ] =q51( input_args )a=[1 2 -3 ; 0 9 0 ; 0 8 -1];
a(find(a<0))=[0]end
QUESTION: 52function [ output_args ] = q52( input_args )A=[1 2 ; 3 4 ; 5 6; 6 7; 8 9 ; 5 4; 7 8; 8 0 ; 3 2; 1 1; 2 2; 3 3; 4 4; 5 6; 7 8]newmatrix=[A(1,:);A(5,:) ; A(10,:);A(15,:)]end
QUESTION: 53function [ output_args ] =q58( input_args )files = dir('*.txt');fori=1:length(2)eval(['load ' files(i).name ' -ascii']);endend
QUESTION: 54function [ output_args ] = q59( input_args )A=[1 2 3 4 5; 6 7 8 9 10]A=reshape(A,1,10)selectfirsteight=A(1:8)end
QUESTION: 55function [ output_args ] = q55( input_args )F=[1 2 3; 4 5 6; 7 8 9]A=[3 -2 1]; B=[6 9 -4];C=[-7 -5 2];a=cat(3,A,B,C)A = [0 -a(3) a(2); a(3) 0 a(1); -a(2) a(1) 0]crossproduct=cross(A,F)end
QUESTION: 56function [ output_args ] = q56( input_args )a = [1 2 3]'
b = [2 4 7]'div=a./bwhy=[1 2 3]/[2 4 7]end
QUESTION: 58function [ output_args ] =q58( input_args )load penny;figure;contour(flipud(P))colormap('Copper')end
QUESTION: 58 (a)function [ output_args ] =q58a( input_args )Z = peaks;[C,h] = contourf(Z,10);text_handle = clabel(C,h);colormap([1 1 0])set(text_handle,'BackgroundColor',[1 1 0],... 'Edgecolor',[1 1 0])caxis([-20 20])title({'Filled Contour Plot Using','contourf(Z,10)'})end
QUESTION: 59function [ output_args ] = q59( input_args )end
QUESTION: 60function [ output_args ] = q60( input_args )set(0,'defaulttextinterpreter','latex')end
QUESTION: 61function [ output_args ] = q61( input_args )x=[1 2 3 4 ]plot(x,cos(x),'-ro',x,sin(x),'-.b')list={'Label 1','Label 2'};leg=legend(list);
set(leg,'Textcolor',[1 1 0])end
QUESTION: 62function [ output_args ] = q62( input_args )set(gca,'color','none')whitebg('blue')whitebg([0 .5 .6])endQUESTION: 63function [ output_args ] = q63( input_args )set(0,'defaulttextinterpreter','latex') x=[1 2 3 4]; y=[ 2 5 6 7]x1=[6 3 7 8]x2=[ 0 9 7 6]plot(x,y,'-og',x1,x2,'--r>')end
QUESTION: 64function [ output_args ] = q64( input_args )tcell = {[1,0], [1,2,3], [3,2,1,4]};lens = cellfun('length', tcell);rmat = NaN(length(tcell), max(lens));fori = 1:length(tcell)rmat(i, 1:lens(i)) = tcell{i}end
QUESTION: 65function [ output_args ] =q65( input_args )c={'Bob', 'Mary', 'Fred','Ken'}s = fprintf(' %s %s \n' , c{1} ,c{3} );end
QUESTION: 66function [ output_args ] = q66( input_args )%calllib('libname', 'funcname', arg1, ..., argN)loadlibrary('MatlabGenericDll','GenericDll.h')calllib('MatlabGenericDll', 'FormatDrive')unloadlibraryMatlabGenericDll
end
QUESTION: 67
Solve the equation ax2+ bx + c = 0 symbolically for x, and next for b.
unction [ output_args ] = q67( input_args )syms x a b csolve('a * x ^ 2 + b * x + c=0','x')solve('a * x ^ 2 + b * x + c=0','b')end
QUESTION: 68. Solve the equation [cos (2x) + sin(x) - 1 = 0 ]symbolically. Next use ezplot to verify the result
function [ output_args ] = q68( input_args )syms x solve('cos(2*x) + sin(x) - 1 = 0','x')ezplot('cos(2*x)', -2, 3)hold onezplot('1-sin(x)', -2, 3)xlabel('cos(2*x)')hold offend
QUESTION: 69
Solve the equation tan(x) + sin(x) - 2 = 0 symbolically. Next, determine the numerical values of the roots.
>>syms x>>f=tan(x)=sin(x)-2>>solve(f);>>sol=sub(f,x,1.5)Sol=2.168
(OR)
function [ output_args ] = q69( input_args )
%You can find this solution by calling the MuPAD numeric solver directly and specifying the interval where this solution can be found. To call MuPAD commands from the MATLAB Command Window, use the evalin or feval functionsolve('tan(x)+sin(x)-2=0','x')evalin(symengine, 'numeric::solve(tan(x)+sin(x)-2, x = 0..4)')end