MATLAB: How to put legend for some of the curves

legendMATLAB

Hi, I've plotted two functions in one plot, in which each function is plotted based on different amount of "p" , i.e. there are 6 numbers for "p", for each function, and I have 12 curves in a plot. The point is my functions are "y1=f(x)" and "y2=-f(x)" , and every pair of functions ( y1, y2) has the same p. Is there a way that I can introduce each pair of curves with one "p" in legend? And those pair which has the same p, plot with the same color? Thank you in advance

Best Answer

I created a example code.

col = [0  ,0  ,0;
       255,0,  0  ;
       0,  255,0  ;
       0,  0,  255;
       255,255,0  ;
       0,  255,255]./255;   % color array
func = @(x,p) p*sqrt(x);    % some function
x = linspace(0,10);
p = 1:6;    % some factor
y = zeros(length(p),length(x));
for i=1:length(p)
    y(i,:) = func(x,p(i));
    plot(x,y(i,:),'Color',col(i,:));    % +function
    hold on
    plot(x,-y(i,:),'Color',col(i,:),'HandleVisibility','off');  % -function, legend is not shown
end
legend(strcat('p=',num2str(p')))

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MATLAB: How to get the equation and display on the graph for line of best fit

Try this

x=[0.200 0.100 0.067 0.050 0.040 0.033 0.025];
y=[0.214 0.158 0.130 0.125 0.136 0.115 0.107];
axis([0 0.025 0 0.025]);
plot(x,y,'x');
hold on
title('lineweaver-burk plot');
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ylabel('1/Vo ');
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ax = axes();
scatter(x,y);
%Plotting the line of best fit 
p=polyfit(x,y,1);
x1=linspace(min(x), max(x), 100);
y1=polyval(p,x1);
plot(x1,y1,'r-', 'LineWidth',3);
X_int = roots (p);
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MATLAB: Columns of a matrix

To call the entire contents of a column of a matrix, use matrix name and the colon operator (:)

Para encontrar la columna de una matriz, utilice el nombre de la matriz y el operador dos puntos (:)

A = [1 2 3;...
     4 5 6;...
     7 8 9]; 
A(:,1) = [1; 4; 7]
A(:,2) = [2; 5; 8]

and so on.

The colon tells Matlab to take the data from every row giving you the entire colomn.. The second number says which column to take from. You can put things like 'i' from your loop in there too.

Best Answer

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MATLAB: How to get the equation and display on the graph for line of best fit

MATLAB: Columns of a matrix

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