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  1. navyguy

    How do I calculate acos in vb?

    I have an equation to be calculated in vb that requires me to calculate the acos of a value. There doesn't seem to appear to be an acos function in vb. I heard you can do some trick with atan. Does anyone know that trick or have any suggestions? Thanks
  2. navyguy

    ?Quickest way to pass and array from VB to excel?

    Hello folks, I have a visual basic macro running in excel. It performs all of the calculations in about 2 seconds but takes 20 seconds to send the data to excel to update an xy plot. I pass the info with a loop like this.. for i = 1 to 1000...
  3. navyguy

    Transient Heat Transfer Equations

    Does anyone know a web page that outlines the 1-D transient (time dependant) heat transfer equations for heat input to a material, conducted through that material to a cooling channel of known shape with constant fluid flow? Thanks
  4. navyguy

    vb subroutine to invert a very large square matrix

    Thankyou for responding! What I am trying to do is to solve for the matrix J in the matrix operation, C*J=A, where C is a known fully populated n x n square matrix, J is a n x 1, and A is a another n x 1 but is only populated by values of 1. Depending on the required accuracy, n could possibly...
  5. navyguy

    vb subroutine to invert a very large square matrix

    Hello, I am looking for a VB subroutine to invert a large (possibly 1000X1000) fully populated square matrix stored as an array (?) for a weapon simulation program I am working on. The matrix should be fairly stable. It is actually to be run in a VB macro in Excel. I am sort of a novice at...
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