Matlab Programming for Engineering Analysis

ans= 1 %%%% Week 5 %For Loop for i=1:n action end for i=1:5 fprintf( '%d\n' ,i) end for i=0:10:100 fprintf( '%3d' ,i) end fprintf( '\n' ) %Sum1toN.m function runsum=sum1toN(n) runsum=0; for i=1:n runsum=runsum+i; %try runsum+=i end end %%% %myfact.m function runprod=myfact(n) %returns n! runprod=1; for i=1:n runprod=runprod*i; end end %%% %% Matlab has a built-in function factorial(), so you can simply do this factorial(10) %%% Sums and products with vectors %myvecsum.m sumel=0; for i=1:length(vec) sumel=sumel+vec(i); end % try myvec([5 9 4]) %% Matlab has a built-in function sum() that does the above, i.e., sum([5 9 4]) %%%%% %myvecprod.m function prodel=myvecprod(vec) prodel=1; sumel=0; for i=1:length(vec) sumel=sumel+vec(i); prodel=prodel*vec(i); end end %%% %% Matlab has a built-in function prod() that does the above, i.e., prod([5 9 4]) %%%%% Example how to loop from the smaller value to the larger %prodMtoN.m function runprod=prodMtoN(m,n) if m>n temp=m; %flip m and n m=n; n=temp; end runprod=1; for i=m:n runprod=runprod*i; end end %%% %Alternatively: %prodMtoN1.m function runprod=prodMtoN1(m,n) if m<n runprod=prod(m:n); else runprod=prod(m:-1:n); end end %%% Try this %myveccumsum.m function outvec=myveccumsum(vec) outvec=[]; runsum=0; for i=1:length(vec) runsum=runsum+vec(i); outvec=[outvec runsum]; end end %%% try myveccumsum([5 9 4]) %%% %A better way: %myveccumsum1.m function outvec=myveccumsum1(vec) outvec=zeros(size(vec)); runsum=0; for i=1:length(vec) runsum=runsum+vec(i); outvec(i)=runsum; end end %%% Matlab has a built-in function cumprod(vec) that does this automatically vec=[5 9 4]; cumprod(vec) %%% %%%% Combining for loops with if statements % Find the minimum component of the vector %myminvec.m function outmin=mymin(vec) outmin=vec(1); for i=2:length(vec) if vec(i)<outmin outmin=vec(i); end end end %%%% Matlab has the functions min(vec) and max(vec) that do this %%% %For loop does not have to explicitly use the iterator variable i for i=1:3 fprintf( 'I will do that.\n' ) end forecho.m %Prompting a user number of times for i=1:4 inpnum=input( 'Enter a number:' ) fprintf( 'You entered %.1f\n' ,inpnum) end % More importantly, you can input the vector %forinpvec.m function numvec=forinpvec(n) numvec=zeros(1,n); for k=1:n inpnum=input( 'Enter a number:' ); numvec(k)=inpnum; end end %%% See above if you can do directly numvec(k)=input( 'Enter a number:' ); %%% %%%% Nested For Loops %printstars.m rows=3; columns=5; for i=1:rows for j=1:columns fprintf( '*' ) end fprintf( '\n' ) end %%% Try this: %printtristars.m rows=5; for i=1:rows for j=1:i fprintf( '*' ) end fprintf( '\n' ) end %%%%% multtable.m function outmat=multtable(rows,columns) outmat=zeros(rows,columns); for i=1:rows for j=1:columns outmat(i,j)=i*j; end end end %%% For example, you could call above fn within this script file

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