There could be several reasons why your graph is not showing up. First, make sure you have correctly entered the equation in the command window. Also, check that you have defined appropriate values for x and y. If the graph still does not appear, try adjusting the axis limits or using the "hold on" command to plot multiple graphs on the same figure.
To change the color or style of your graph, you can use the "plot" command with additional arguments. For example, you can specify the color by adding a string argument after the equation, such as "plot(x,y,'r')" for a red line graph. You can also change the line style by adding a third argument, such as "plot(x,y,'--')" for a dashed line graph.
The "plot" command is used for plotting a specific set of data points, while "ezplot" is used for plotting mathematical equations. "ezplot" automatically generates a range of data points based on the given equation and plots them as a line graph. You can also use the "fplot" command for more complex equations that cannot be plotted with "ezplot".
To add a title and labels to your graph, you can use the "title", "xlabel", and "ylabel" commands. These commands take in a string argument that specifies the text to be displayed. You can also use the "legend" command to add a legend to your graph if you have multiple plots on the same figure.
Yes, you can save your graph as an image in several different formats such as PNG, JPEG, or PDF. To do this, you can use the "saveas" command and specify the desired file type and name. For example, "saveas(gcf,'mygraph.png')" will save the current figure as a PNG image. You can also use the "print" command to customize the size and resolution of the saved image.