program error :Unbalanced or unexpected parenthesis or bracket

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amir khalighi
amir khalighi 2018-5-4
评论： Ameer Hamza 2018-5-4
Hi all
I wrote a program for below formula , but when i run it , it face an error (Unbalanced or unexpected parenthesis or bracket.)
and also for C calculated amount I need a fixation : when calculated C from above formula is less than 0 put C=0 and when C is amount from above formula is bigger than 0 put C=calculated amount ( i mean for exmple when it become -20 then put C=0 and for example when C=20 put C=20 and make no changes)
I attached the program but for certain I write the code here :
clc;
clear;
r=0.01;
u=0.05;
d=-0.04;
n=4;
j=0;
St=40;
K=25;
p=(r-d)/(u-d)
C=(1/(1+r)^n)*(symsum(nchoosek(n,j)*p^j*(1-p)^(n-j)*max(0,((1+u)^j)*(1+d)^(n-j)*St/K))),j,0,n)
Could anyone help me and fix change the program to work and fix C amount
I'm in hurry and just have 2 hours
plz help me
thank you all
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Ameer Hamza
Ameer Hamza 2018-5-4
As evident from the error message, you are having unbalanced brackets. You should clearly pay attention to error messages. Also max() function will only work on symbolic expression if you clearly describe its type. Here is the corrected code
clc;
clear;
r=0.01;
u=0.05;
d=-0.04;
n=4;
syms k integer;
St=40;
K=25;
p=(r-d)/(u-d);
C=(1/(1+r)^n)*symsum((nchoosek(n,k).*p.^k*(1-p).^(n-k).*max(0,((1+u).^k).*(1+d).^(n-k).*St/K)),k,0,n);
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amir khalighi
amir khalighi 2018-5-4
Error using sym/max (line 97) Input arguments must be convertible to floating-point numbers.
Error in math (line 11) C=(1/(1+r)^n)*symsum((nchoosek(n,k).*p.^k*(1-p).^(n-k).*max(0,((1+u).^k).*(1+d).^(n-k).*St/K)),k,0,n);
  • what should i do now?
Ameer Hamza
Ameer Hamza 2018-5-4
Have you ran the following line.
syms k integer;
I also changed variable name from j to k, to avoid conflict with MATLAB internal constant.

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