matlab计算SDM模型时候出现以下问题，该怎么解决啊，求教高手
Attempted to access bdraws(1,5); index out of bounds because size(bdraws)=[1000,4].

Error in sdm (line 331)
            beta = [bdraws(i,j) bdraws(i,j+p)];

Error in sdm_d2 (line 26)
results = sdm(y,x,W);