MATLAB: Shift array to flat

array

hello,
i have a 142 element array that generates a curve (attached). when a line is drawn from end to end the line is at a certain (unknown) slope. how could i adjust the values in the array so that when plotted and a line drawn from end to end of the curve, the slope is 0?
picture and array is attached.

Best Answer

 plot( unnamed, 'b' ) ;
 hold on ;  grid on ;
 x = (1 : length(unnamed)).' - 1 ;
 slope = (unnamed(end) - unnamed(1)) / (length(unnamed) - 1) ;
 y = unnamed - (unnamed(1) + x * slope) ;
 plot( y, 'g' ) ;
but we often need something else :
 plot( detrend( unnamed ), 'r' ) ;
with
 >> mean( detrend( unnamed ))
 ans =
  -3.9612e-18
 >> mean( y )
 ans =
   -0.0011
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