Grasshopper

algorithmic modeling for Rhino

hello, 

i think i have a fairly simple question.  i have imported a set of 9 points from a spreadsheet and i'd like to make a surface from those points.  i have set my u value to number of points + 1  (10) because i believe from reading elsewhere that is what i should do.  i receive the error message that the u count is not valid for this operation.

any suggestions?

files attached. 

thank you,

prentiss

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i've changed it so that i'm not culling the first point.

question about the u count. i thought the u count should be 1+ the number of points across (x axis).  i have 7 points across and 1+7 =8, so shouldn't the surface component only accept the number 8?  it accepts 5 and 7.  the grid is 7 points in the x direction and 5 points in the y direction.  so shouldn't the u count be either 6 or 8?  

it works with the u count at 5.  i just don't understand why.

thank you so much for your patience with my questions.

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