How do I plot all values in my IF loop?

I am writing a function, which cannot use the findpeaks or islocalmax, to plot all the maximum values on a graph. However with my if loop it plots each maximum value on a different figure

How do I display them all on one figure? Help very much appreciated.

Here is my function:

function [k] = Peak(X,Y)

for k = 2:length(Y)-1
if (Y(k) > Y(k-1) & Y(k) > Y(k+1) & Y(k) >100)
    figure
    plot(X,Y,X(k),Y(k),'r*')
end
end

    
end

[Monica Mahesh]

I see blank plot sheet after running this.Can you please help me to get the plot in this program

for k=0:M:M*N;

x=k+y;

m=2;

plot(x,m,'k')

hold on;

end

for k=2:M:M*N;

x=k+y;

m=0;

plot(x,m,'k')

hold on;

end

hold off;

axis([0 12 -0.5 2.5])

[Voss]

@Monica Mahesh: You are plotting one point at a time, in which case you'll need a data marker to see the points:

y = 1; % I make up some values here
M = 2;
N = 5;

for k=0:M:M*N;
    x=k+y;
    m=2;
    plot(x,m,'*k'); % use marker '*' for instance
    hold on;
end

axis([0 12 -0.5 2.5])

Or, if you want to plot a line to connect those points, you can plot them all at once:

figure();

x = (0:M:M*N)+y;
m = 2*ones(1,numel(x));

plot(x,m,'k')

axis([0 12 -0.5 2.5])

Answer 1

[Image Analyst]

Instead of the call to figure, call subplot() instead.

rows = ceil(sqrt(length(Y) - 2)); % Can put this line outside the loop
subplot(rows, rows, k-1); % In the loop, replace figure with this line.

This will make an array of several graphs (axes) all on the same figure.

If you want them all on the same graph/axes, then don't call subplot() at all, but call hold on after plot, and use && instead of &.

function [Peak] = findLocalMaxThreshold(X,Y)
for k = 2:length(Y)-1
	if (Y(k) > Y(k-1) && Y(k) > Y(k+1) && Y(k) >100)
		plot(X,Y,X(k),Y(k),'r*')
		hold on;
	end
end
hold off;
end

[ImperialStar]

This is perfect thank you very much