MATLAB: Plotting a line in matlab

lineplotting

Hi everyone, I am trying to draw a stright line beneath this graph for comparison evaluation but this code doesn't work for me. Any help guys.

xline = linspace(1,14,14);
xline = 1e6*xline;
yline = xline;
plot(xline,yline,'-r*','LineWidth',4);

Best Answer

I do not think you need to do the 1e6*xline as the current plot you have looks to be already scaled to Mbps. Also since you're plotting a lines in two different commands you'll need to use the command 'hold on'.

such as:

figure,plot([1:10],[1:10].^2);
hold on
plot([1:10],[1:10]);

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MATLAB: Creating different sections in one graph

Hi Ahmed,

It is my understanding that you have a set of points to plot of a graph, and you have different equations which divide the graph into different regions and you wish to partition the graph based on the equations using various colours. Assuming you know the equations which partition the graph this can be accomplished by the fill function in MATLAB. An example is also given in this answer. To apply different markers in different regions you can use logical indexing and plot separately as explained in this article. This is implemented as follows assuming some 4 dummy functions as regions and one line to be plotted across different regions,

Assume the 4 curves and lines to be as follows,

x1 = ones(1,450); 
x2 = 1:5; 
x3 = -1*ones(1,450); 
x4 = 5*ones(1,450); 
y1 = 1:450; 
y2 = (4*x2).^2 + 50; 
y3 = y1; 
y4 = y1; 
xline = -1:0.1:5; 
yline = 200*ones(1,length(xline));

partitions can be made by


x1_f = [x1 fliplr(x3)];  % Creating closed are for fills
y1_f = [y1 fliplr(y1)]; 
x2_f = [x1 fliplr(x2)]; 
y2_f = [y1 fliplr(y2)]; 
x3_f = [x2 fliplr(x4)]; 
y3_f = [y2 fliplr(y4)]; 
plot(x1,y1,'k','LineWidth',2); 
hold on 
plot(x2,y2,'b','LineWidth',2); 
plot(x3,y3,'r','LineWidth',2); 
plot(x4,y4,'k','LineWidth',2); 
fill(x1_f,y1_f,'g') 
fill(x2_f,y2_f,'r') 
scatter(xline(xline<1),yline(xline<1),'r*'); 
scatter(xline(xline>1&xline<3),yline(xline>1&xline<3),'ks') 
scatter(xline(xline>3),yline(xline>3),'md') 
hold off

Thanks

Kiran

Best Answer

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