#For loops matlab update#
The call to drawnow isn't neccessary in each iteration, it is only used to update the visuals, so you can see the changes directly. H_stairs = stairs(h_axes, x, y, 'XDataSource', 'x', 'YDataSource', 'y') % and bind the variables x and y as its data sources % Create graph object, in this case stairs Therefore I suggest using datasources: Update graph using data sources % Create a panel and axes object If you want to draw a curve as you add data, try the following: x = linspace(0,2 * pi, 100) īe aware that the plot automatically tries to set x and y limits (curve is scaled to the plot window), to prevent that you have to manually set the x- and y-limits with xlimand ylim.Īs Matt wrote in his answer, calling plot in each iteration is quite expensive (i.e. Note that calling plot every time within the for-loop is unnecessarily expensive and I don't recommend it. As a last step you can update the plot by changing its XData and YData properties and calling drawnow. Within the for-loop calculate the values and add them to the y-vector as shown above. Additional keywords provide finer control over the. Loops use a for or while keyword, and conditional statements use if or switch.
#For loops matlab code#
Within any program, you can define sections of code that either repeat in a loop or conditionally execute. In case you insist on plotting within each iteration, the previous code from Solution 2 can be expanded as follows: Create a figure, add an 'empty' plot to it and store its handle. Control flow and branching using keywords, such as if, for, and while. Solution 3: Dynamically update plot while calculating If you want to calculate the values within a for-loop and plot it afterwards: Pre-allocate the needed variable (in this case y), calculate the values within the for-loop and finally plot it with one single command after the calculation. Solution 2: Calculate values within for-loop and plot afterwards If you want to plot the points itself, use LineSpec-syntax when calling plot like this 1: plot(x,y,'*') ġ) Other types of points are possible as well, see the above linked documentation. Note that y is a vector as well as x and that y(n) equals to sin(x(n)) for all n. So the following code does probably what you want: x = linspace(0,2*pi,100) In that case no for-loop is needed because you can calculate and plot vectors directly in MATLAB. I assume you meant to draw a continuous line. Solution 1: Vectorized calculation and direct plot With plot(x(i),y) you are plotting 100 single points (one in each iteration) and they are not shown by default.
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