Hi, Bit-Warrior-

(DIFFPREP questions will have to go to the TORTOISE folks. I will just note that it is possible in v3.1.1 and onward to dwi/bvecs/bvals files directly into it, using option flags of those names.)

Can I please have some more details of what you are trying to do and precisely what isn't working?

1dDW_Grad_o_Mat++ can have many types of bvec/grad/bmatrix and bval. The input flags start with "in" are:

-in_bvals     -in_col_matA  -in_col_matT  -in_col_vec   -in_row_vec

If you have a Siemens (or other) gradient table file in good standing, then you should be able to use likely either -in_col_vec or -in_row_vec, depending on whether it is column- or row-oriented, respectively. Do you want to multiple a b-value times it? Or something else? Perhaps you could copy+paste the specific grad table here (or at least a few lines) and describe what you want to do with it using 1dDW_Grad_o_Mat++?

--pt