MATLAB: How to use previous points calculated from a function.

Question

Hello I have the following function

d=abs(B32 + A32*[X;Y]);sqrt(A32(1,1)^2+A32(1,2)^2);

the answer (d) changes based on the row matlab is on.

I have no problem calculating (d) based on the row.

What I want to do is use an equation R = d2*(t2-t1)/(d1-d2)

What I want to do is d2 to equal the current (d) that is being calculated.

I want d1 to equal the previous answer for (d).

I want the first d1 that is used to = 0 then the next d1 to equal (d) and so forth.

Is this possible.

Any help is greatly appreciated.

Answer 1

% Plotting the TestPoints on the graph

for i = 1:size(TestPoints,1)

X=TestPoints(i,2);

Y=TestPoints(i,3);

Delta1=log(P1)-0.5*mu1*inv(Sw)*mu1'+mu1*inv(Sw)*[X;Y];

Delta2=log(P2)-0.5*mu2*inv(Sw)*mu2'+mu2*inv(Sw)*[X;Y];

Delta3=log(P3)-0.5*mu3*inv(Sw)*mu3'+mu3*inv(Sw)*[X;Y];

pause(1)

clc

% The first initial d1 = 0 because there is no previous distance. It's the

% first one. The next d1 will have the previous value of d2.

try

d1;

catch

d1=0;

end

% The first initial t1 = 0 because there is no previous time. It's the

% first one. The next t1 will have the previous value of t2.

try

t1;

catch

t1=0;

end

%

d2=abs(B32 + A32*[X;Y]);sqrt(A32(1,1)^2+A32(1,2)^2); % Distance to the LDA Boundary that separates aged and replace

t2=TestPoints(i,1); %time in seconds for the particular datapoint

%

%Calculating the Remaining Useful Life

RUL = d2*(t2-t1)/(d1-d2); % Units are in seconds

RUL_days=RUL/86400; % Units are in days

d1=d2;

t1=t2;

pause(1)

end