OrCad Spice - plotting tangent line of curve

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The discussion centers on the challenge of plotting a tangent line on a curve in OrCad Spice, specifically how to evaluate the derivative at a specific point. The user is familiar with using the d() function to plot the derivative of the entire curve but seeks guidance on point evaluation. A suggestion is made to place a marker at the desired point to obtain the numerical derivative, which could serve as a workaround. The conversation highlights a common issue faced by users of OrCad Spice regarding derivative evaluations. Overall, the thread emphasizes practical solutions for plotting derivatives in circuit simulation software.
sayeo87
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Hi, I'm having trouble plotting the tangent line on a curve (or the derivative evaluated at a point) in spice. I know how to plot the derivative of the entire curve using the d() function, but I don't know how to evaluate it at a point. Any help is much appreciated!
 
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I don't use OrCad so I probably can't offer much help. But if you can plot the derivative of the entire curve. Why not just put a marker at the point you want. That will tell you the numerical derivative.
 
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