plotting a function from anothe .m file , please help

i am facing a problem plotting this function

.m

function f=objfun244(tp)
% The objective function: total cost per unit time if replacement interval is tp
% Assumption: The smallest time unit is week. 

% f: total cost per unit time
% tp: Length of the time interval in Weeks (preventive replacement interval)

global Cp Cf   % cost of preventive replacement and failure replacement, respectively
T =ceil(tp);

% f: total cost per unit time C_tp
f=(Cp+Cf*HT(T))/tp;

% % Test
% objfun244(4)

then on another .m file which is called plotting2.m here is the code i wrote

clear all;

clc;

t = i:1:12;

plot(t,objfun244(t));

grid on

xlabel('t')

ylabel('COST')

---------------------------------------

there is another function called H T , here is its code

function H=HT(T)
% The recursive function H(T)
% Calculate the Expected number of failures in (0,T], for Weibull
% Distribution
% Assumption: T's unit is week, the smallest time unit. 

% H: the Expected number of failures in (0,T] 
% T: length of the time interval in weeks (preventive replacement interval)
% T is a nonnegative integer: 0, 1, 2, 3, ...

global Al Be % Alpha and Beta for the Weibull distribution, respectively  % #####
global HT_vec HT_flag % Calculated H(T) values: HT_flag(T)=1 if it has been calculated

H=0;   % H(0)=0: initial value

if T<0.001

%     H=0;   % If T=0, H(T)=0;

elseif HT_flag(T)>0
    % If HT(T) has been calculated, used the saved value    
    H=HT_vec(T);  % Assign the value from HT_vec

else
    % Otehrwise, recursively calculate H(T)
    % i: time from 0 to T-1

      for i=0:(T-1)
          H=H+(1+HT(T-i-1))*(wblcdf(i+1,Al,Be)-wblcdf(i,Al,Be)); % #####
      end
      % Save the calculated H(T) value
      HT_vec(T)=H;
      HT_flag(T)=1;
  end

----------------------------------------------------

i got error : ??? Subscript indices must either be real positive integers or logicals.

Error in ==> HT at 20
elseif HT_flag(T)>0

Error in ==> objfun244 at 12
f=(Cp+Cf*HT(T))/tp;

Error in ==> plotting2 at 11
plot(t,objfun244(t));

-----------------------------

pleaseeee hellpppppp

Answer 1

[Matt Fig]

The problem is here:

clear all;

clc;

t = i:1:12;

Did you mean

t = 1:12;

[Tareq]

It suppose to be i = 1:1:12

[Tareq]

yes

[Tareq]

can u please a propose a way how to plot at least HT.m function

[Matt Fig]

So if you use

t = 1:12;

what happens?

[Tareq]

Attempted to access HT_flag(1); index out of bounds because

[Tareq]

??? Index exceeds matrix dimensions.

Error in ==> HT at 20 elseif HT_flag(T)>0

Error in ==> plotting2 at 8 plot(t,HT(t));

[Matt Fig]

HT_flag is global. Using global variables is generally not necessary and frowned upon because of things like this!

You have a global variable that was not defined, or that is empty.

But there are other issues with your code. For example, in HT, T is a vector, but you are passing it to the IF as if it were a scalar. Did you mean to do this? See this article:

http://blogs.mathworks.com/loren/2012/06/15/whats-if-all-about/

Specifically, look at the comment she refers to in the opening paragraph...

[Tareq]

function H=HT2(T)
% The recursive function H(T)
% Calculate the Expected number of failures in (0,T], for Weibull
% Distribution
% Assumption: T's unit is week, the smallest time unit. 

% H: the Expected number of failures in (0,T] 
% T: length of the time interval in weeks (preventive replacement interval)
% T is a nonnegative integer: 0, 1, 2, 3, ...

global Al Be % Alpha and Beta for the Weibull distribution, respectively  % #####
global HT_vec HT_flag % Calculated H(T) values: HT_flag(T)=1 if it has been calculated

T= 2:1:12;
H=0;   % H(0)=0: initial value
for i2 = 1:length(T)
if HT_flag(T(i2))>0
    % If HT(T) has been calculated, used the saved value    
    H=HT_vec(T(i2));  % Assign the value from HT_vec

else
    % Otehrwise, recursively calculate H(T)
    % i: time from 0 to T-1

      for i=0:(T(i)-1)
          H=H+(1+HT2(T(i)-i-1))*(wblcdf(i+1,Al,Be)-wblcdf(i,Al,Be)); % #####
      end
      % Save the calculated H(T) value
      HT_vec(T(i))=H;
      HT_flag(T(i))=1;
  end
  end

plot(T,HT2(T));

grid on

xlabel('t')

ylabel('COST')

[Tareq]

what about still give me error?

[Matt Fig]

Please use the {} Code button when pasting code. And be specific in your questions. What did the error message say? I bet it is here:

for i=0:(T(i)-1)

In this line you are defining i for the first time (masking MATLAB's imaginary unit, I might add), so you cannot refer to it in the same line.