 Previous A basic example Home ▸ Documentation ▸ SmileLab ▸ Scripting ▸ Making graphs by script ▸ A basic example Here are two commented examples of use of QuickPlotLib to illustrate our introduction: a basic first one, then a more sophisticated example. Plotting a function y = f(x) with QuickCurve QuickCurve({-1, 1}, "cos(x)*sin(10*x^2)", 0) Import script The prototype for QuickCurve is QuickCurve(x, y, object). To plot a function, we pass the range {-1, 1} for x and the formula "cos(x)*sin(10*x^2)" for y. Specifying 0 for the object is what you do by default: the new curve will come in a new window. Viewing the spectrum of 2d field with QuickFFTSurface Viewing the spectrum makes more often sense for data which come from experiments. Here we do not have an experiment, so we shall plot the spectrum of an analytic function. set nc to 128 set nr to 128 set x to creatematrix "x" ncols nc nrows nr range {0, 2 * pi} as matrix set y to creatematrix "y" ncols nc nrows nr range {0, 2 * pi} as matrix set {x, y, z} to QuickFormulaMatrix(x, y, "sin(2*(x^2+y^2))*sin(2*sqrt(x+y))") QuickFFTSurface(z, "FFT") Import script creatematrix is discussed in the Chapter about the Scientific environment. creatematrix makes a 2d matrix with the specified sizes. The "x" or "y" parameter is how you initialize it with x or y values. QuickFormulaMatrix(x, y, formula) returns the matrix obtained by evaluating the formula for the values of x and y provided in the x and y parameters. Finally, QuickFFTSurface(z, object) computes the 2d Fast Fourier transform of its z argument. QuickFFTSurface plots the modulus of the Fourier transform as a surface f(x,y). The phase of the Fourier transform is mapped into the color of the surface: the color scale is [-pi, pi]. The other example was obtained using a different formula.    Copyright ©2008 Paris, Satimage