trapuneq (unequal spaced trapezoidal rule quadrature)

Hi... I hope that I can solve a problem about trapenuq formula

x = [0 .12 .22 .32 .36 .4 .44 .54 .64 .7 .8];
y = 0.2+25*x-200*x.^2+675*x.^3-900*x.^4+400*x.^5;
trapuneq(x,y)

??? Undefined function or variable 'l'.

Error in ==> trapuneq at 18 s = s + (x(k+l)-x(k))*(y(k)+y(k+l))/2;

thanks

[Walter Roberson]

trapuneq appears to be from coursehero; https://www.coursehero.com/file/17914642/trapuneqm/

Answer 1

[Sam]

Changing the 2 "l"s ("L"s; Capital shown for variable clarity) to a "1" ("One") in the line of the For loop fixes the error and allows the same anser to be attained as shown in the textbook (1.5948).