a=-w**2;   a=x`[1,2]; ... View more

b={4 9, 16 25, 36 49}; x={7 5, 16 9}; a=sqrt(b); * Assign square root of each element of B to corresponding element of A; y=inv(x); * Call INV function to compute inverse matrix of X and assign results to Y; r=rank(x);     I do not know how inv is calculated. I do not know how I can get the follow numbers. Can you explain the function of inv?Thanks.   -0.529412 0.2941176 0.9411765 -0.411765     ... View more

I need to read the values of the dependent variable y from the sas data I created into an n * K matrix, where n is the number of obs in each group and k is the number of levels of my cateogrial variable.   i need first to write k statements to read the obs from the dataset into k column vectors of dimension nX1, then needd to write a statment that horizontally concatenates these k columns vectors to form the n * k matrix   w ... View more

Hi I just started to study SAS iml. it is hard for me to understand   would anybody explain.   do until(w<1e-3);                     /* begin do loop */   my questions:  why is it used? Why "w" and "1e-3"?     y = 0.5#(z + x/z); * Estimate square root;   my questions: Why it is written like that? But not: y = 0. 5#z or 0.5#x I do not understand it would you please give advice that helps me to understand? Thanks. ... View more

i know there is put statement, that can add "," to the number, thus, 2378912 can be changed to 2378,912   PUT INCOME2 comma8.2; variable Number and percent   expect, number will be like, 1234,569 percent will be like, 0.63   my question is I am not using proc sql, nor any data steps. I am using proc freq and hope the output be like 2378,129 instead of 2378129 since the code will be proc freq, proc print I do not know where I can put commax statement, or how to change the format of numbers, to add "," to the total number, but without dicimal, 2378,129 not 2378,129.0. however, in the same output, i want to the percent will be 0.63 would anybody provide a sample code? Thanks.   ... View more