this quetion might sound confusing
i have the 840 rows of the following is a sample
f(:,1) f(:,2) f(:,3) air 0.693 0.329 0.013 train 0.109 0.203 0.168 bus 0.356 0.153 0.250 car 0.010 0.076 0.193
this the previous function i had which was easy
fun = @(x)[(((1+x(4))*(x(1)*f(:,1) + x(2)*f(:,2) + x(3)*f(:,3))) + (x(4)*((f(:,1).^x(1)).*(f(:,2).^x(2)).*(f(:,3).^x(3)))) + ep - en - u);
the question i like to code the following for all the my data. i want to do the following opation on every 4 rows grouped togther
to explain further
x(1)*((column1,row1) - (column1,row2))+ x(2)*((column2,row1)-(column2,row2))+ x(3)*((column3,row1)-(column3,row2))x(1)*((column1,row1) - (column1,row3))+ x(2)*((column2,row1)-(column2,row3))+ x(3)*((column3,row1)-(column3,row3))x(1)*((column1,row1) - (column1,row4))+ x(2)*((column2,row1)-(column2,row4))+ x(3)*((column3,row1)-(column3,row4))
i am basically taking the first row minus the other rows in each column
this will repeat for the set of 4 untill i get to the end of 840 enteries
i hope someone can help
Best Answer