I have a matrix which contains many values for kd, x/d, z/d, Ec1 (reinforced concrete). for a given value of u.sd for example i need to search the matrix for the first higher and lower values than the given one, and with those values , with the linear interpolation to compute the other values in other columns for the corresponding given number.
I had a similar code for C# that my brother wrote for me but since he doesn't know how mathcad works i can't translate into mathcad functions. I will try to explain with a picture:
