Re: [Gretl-users] Error in Loop procedure

Hi there,   I’m still working on the restricted OLS regressions and in the meantime even uploaded an early version of a function package that uses a SQP of GNU R and a bootstrap routine to get coeffs and standard errors.   In order to produce a nice show case of the optimization problem I generate all combination of coefficients with a step size of n. If there are 3 coeffs that are >=0 and should sum up to 1 the matrix can be easily generated via loop. Since gretl has a special "for loop" one could use this loop version in order to fill the percentages in the matrix in one step. However, there is a bug. Have a look. I’m using the current x64 snapshot for windows.  

Cheers and a nice first Sunday in Advent Leon <hansl> scalar intN_1_a = 50 # step size of 2 percent scalar intStep = 1/intN_1_a eval intStep matrix mCombis = NA matrix mCombisALL = NA set stopwatch loop for i=0..intN_1_a --quiet loop for j=0..intN_1_a --quiet if i+j<=intN_1_a if i+j == 0 mCombisALL = i ~ j ~ (intN_1_a-i-j) else mCombisALL |= i ~ j ~ (intN_1_a-i-j) endif endif endloop endloop eval $stopwatch/60 eval rows(mCombisALL) # correct number of rows since scalar intSum3 = (intN_1_a)*3 + (1+intN_1_a-3+1)*(1+intN_1_a-3)/2 # for three coeefs I found this closed formula, with more it’s another… eval intSum3 set stopwatch loop for (i=0; i<=1; i+=intStep) --quiet loop for (j=0; j<=1; j+=intStep) --quiet if i+j<=1 if i+j == 0 mCombis = i ~ j ~ (1-i-j) else mCombis |= i ~ j ~ (1-i-j) endif endif endloop endloop eval rows(mCombis) eval $stopwatch # correct number scalar intSum3 = (intN_1_a)*3 + (1+intN_1_a-3+1)*(1+intN_1_a-3)/2 eval intSum3 # wrong, WHY? The reason has to do with the.xx999 values and the missing 1s. <hansl>