Xtitle ( “y=x^2”, “X axis”, “Y axis” ) function y=f( x)
For this purpose, we use the xtitle function. We can configure the axes of our plot as well. We use the title function in order to configure the title of our plot. Now we are going learn the Scilab graphics features which configure the title, axes and legends of an x-y plot. Plotting of the curve on Graphics Window Titles, axes and legends The previous plot was cleared through the clf command (“clear figure“). For this we have to define two functions: y=f(x) and y=g(x).īy adding the program below, we obtain the plot of two curves, f(x)=x^2 and g(x)=x^3. Let two functions are f(x)=x^2 and g(x)=x^3. Now we are going to plot two functions on the same figure. Program on scilab editor or SciNotes function y=f( x) With the program below, we plot the curve defined by f(x)=x^2 We can produce the same plot without generating the intermediate array y. We finally use the plot function so that the data is displayed as an x-y plot.
This produces the row vector y, which contains 20 entries. Using this we can get the function value at the given points. The x variable now contains a row vector with 20 entries, where the first value is equal to -5 and the last value is equal to +5. We use the linspace function in order to produce 20 values in the interval. x=linspace(a,b,n) in which a is the smallest value of variable x, b is the largest value of variable x and n is number of values calculated between a and b. We can use the linspace function in order to produce linearly spaced vectors. We begin by defining the function which is to be plotted.
Scilab linspace how to#
Scilab 2D Plots of plane curves defined by function y=f(x)įirst we are going to learn how to produce a simple x-y plot. Plot command is used to create plots in the plane(2D Plots).
Scilab can produce many types of 2D plots (plots in the plane) with the plot function. Then we are going to customize the title, the legend, the objects appearance and the axes operations of our graphics. Here we are going to learn how to create Scilab 2D plots. Define array x for which the derivatives will be calculated.Scilab offers many ways to create and customize various types of plots and charts.
Scilab linspace code#
Illustrating this through your code example: // Define limits Using this method is better than using the diff function because the output array is of the same size as the original one. Both are actually meant to be used in conjunction because the interp function requires the corresponding derivatives for your y values, which you can easily get through the splin function. The former will give you the corresponding first derivative of your array values while the latter will give you up to the third derivative. This elegantly works not only for piece-wise defined functions but also for functions defined numerically by data. I accidentally (but fortunately) found the elegant solution to your end goal (and also to mine) of calculating and plotting the derivatives through the SciLab documentation itself via the splin ( ) and interp ( ) functions. (I expect the result 3 3 and not a matrix.) Calculate derivative of f(x) at the positions x Define array x for which the derivative will be calculated. PS: Is this the right place to ask Scilab-related questions? It seems that there are several StackOverflow communities where Scilab-related questions are asked. But what is then the purpose of numderivative?
Scilab linspace update#
Update 1: Maybe I use the wrong function and diff is the way to go.Problem: It seems that I do not understand how the argument x works since the result is not a 1D-array, instead, it is a matrix.My Google-Fu lead me to the numderivative function.I tried to start small and just use a simple (continuous) function: f(x) = 3*x.As my end goal, I want to calculate (and plot) the derivative of a piece-wise defined function, see here.I am a new user of Scilab and I am not a mathematician.
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