Your function is UNDEFINED (Illegal) at X=(-1.4656) because the denominator becomes 0 at this point which involves division by zero. If your graph includes this X value, that's probably the problem.Electro said:Hi there,
I have a simple function and I want to plot it in MATLAB but i get an error.
Maybe someone can help. The function is of the type 1/(X^3 + X^2 +1)
I can plot a polynomial but I have no idea about the function above.
Thnx
To plot this function in MATLAB, you can use the plot function and define the x-values for the range you want to plot. Then, use the function 1./(x.^3 + x.^2 + 1) as the y-values. Finally, use the xlabel and ylabel functions to label the axes and title function to add a title to your plot.
You can change the color of your plot by adding a third argument to the plot function, specifying the color you want. For example, plot(x, y, 'r') will plot the function in red. You can also use other color codes such as 'b' for blue, 'k' for black, or 'm' for magenta.
To add a legend to your plot, you can use the legend function after plotting your function. You can specify the labels for each plot as separate arguments, or you can use the 'DisplayName' property in the plot function to specify the labels. For example, plot(x, y, 'b', 'DisplayName', 'Function 1'); legend('Location', 'best') will plot the function in blue and add a legend with the label "Function 1" in the best location.
To change the range of your plot, you can use the xlim and ylim functions. For example, xlim([-10, 10]) will change the x-axis limits to -10 and 10. You can also use xlim([xmin, xmax]) and ylim([ymin, ymax]) to specify different ranges for the x-axis and y-axis, respectively.
To save your plot as an image file, you can use the saveas function. This function takes two arguments, the first being the figure handle and the second being the file name. For example, saveas(gcf, 'plot.png') will save your plot as a PNG file named "plot.png". You can also specify the file type by adding the file extension to the file name.