Help! Symsum formular in matlab

Hi i am new to matlab and i am currently having some trouble with this fomular, i want to implement this fomular into matlab but dont know how

m = 200

with w is a 1xm matrix

lamda is a mx1 matrix

y is a 1xm maxtrix

x is a 8500xm matrix

PS: this fomular is from calculating the Weight in dual form SVM with y is the train label and X is the train data with 8500 sample and 200 features each sample

Answer 1

[David Hill]

w=(lamda'.*y)*(x');

[Kien Tang]

thank you so much for the help