PPI Matrix close to singular warning

From ACLab Wiki

Hey all, this error might mean SPM is trying to use too much precision. To remove the error (from D Gitelman):

In spm_PEB.m try changing the last line of the file (line 371) from

C = inv(C + speye(length(C))*exp(-32));

to

C = inv(C + speye(length(C))*exp(-16));'

Peace!