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help needed in XY graph inlabview

can any 1 tell me how to control the x-axis value to generate a ramp
signal of defined ramp rate or slope

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If your ramp is spaced equally in X, you don't need an xy graph. Just feed the ramp containing the Y values to a waveform graph and adjust x0 and dx of the x-axis as desired. You only need an xy graph if the x-value spacing is not uniform.
 
You can for example generate a ramp array using "signal processing ..signal generation...ramp pattern".
 
It would help if you could explain in a few more sentences exactly what you need. Maybe attach a drawing or small VI.
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