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In Mathematica is possible to plot a function of variables and parameters, giving the possibility to have a slider to change interactively the parameter values. For example this input Manipulate[Plot[1-a/x, {x, 0, 10}], {a, 0, 20}] outputs the plot of the function 1-a/x, where x is the variable, so values are on the x-axis, and a is a parameter and it's exact value is set on a slide bar, between 0 and 20, that appears with running. I tried to do that with Sage, using the @interact possibility but I cannot find a solution for that. Could someone help me?