having trouble plotting 2 graphs

Question

0 个投票

hello, i am having some trouble superimposing 2 graph. when i run the following script, matlab says that the vectors are not equal (i am guessing this is because one is in months while another is in years??). can someone please point out what i am doing wrong?

n = 18*12+1;
balance([1,n],1)=[2000;0];
for b1=2:n
      balance(b1)=(balance(b1-1)*(1+(5.5/1200))+200);
end
for year=2:22
cost(year)= cost(year-1)+(cost(year-1)*0.08);
end
totalcost= cost(19)+cost(20)+cost(21)+cost(22);
figure(1)
x=1/12*[1:216];
y1=balance;
y2= ones(1,216)*totalcost;
plot(x,y1,'k', x,y2,'b')