Differential Equation: y-values gets shifted to the left 3 spots

I´m not sure how this happened, but somewhere in my code, the values for my y get shifted 3 decimal points to the left. Could someone show me where this occurs and how to fix it? Thanks.

My code:

function [xvalues, yvalues] = euler %%% y'(x)=-y(x)/x with y(10)=-9.9 and y(-10)=19.9. %%% Ideally, I'd like to solve this problem on the interval [-15, 15], but %%% in practice, let's solve it on the union %%% of the two intervals [-15, 0.05] and [0.05, 15].

clear all;

format long;

f=@(x,y) (-y/x)

dx=0.05;

xi=-15;

xf=15;

x=xi:dx:xf;

y=xi:dx:xf;

%x(101)=-10;

y(find(x==-10))=19.9; %y(-10)=19.9

%x(501)=10;

y(find(x==10))=-9.9; %y(10)=-9.9

%Euler

for i=1:length(x)

    j=(length(x)-i+1);

    if find(x==10+dx)<=i && i<=find(x==15)

        y(i)=y(i-1)+((-y(i-1)/x(i-1))*dx);

    end

    %if find(x==dx+dx)<=j && j<=find(x==10)

    if 303<=j && j<=find(x==10)

        y(j-1)=y(j)*x(j-1)/(x(j-1)-dx);

    end

    if find(x==-10+dx)<=i && i<=302

        y(i)=y(i-1)+((-y(i-1)/x(i-1))*dx);

    end

    if find(x==-15+dx)<=j && j<=find(x==-10)

        y(j-1)=y(j)*x(j-1)/(x(j-1)-dx);

    end

end

%List x and y

xvalues=x'

yvalues=y'

%When the yvalues print, the decimal point is shifted 3 points to the left.

%Example: -0.006588963210702 should be -6.588963210702