MATLAB: How to find intersection point or value between two array???

arraymatrix array

I have two array as A and B, where,

A=[1.2222 1.2233 1.3344 1.3354 1.4354]
B=[1.1123 1.2234 1.3254 1.4892 1.5678]

I want 2nd element of A and B to intersect but as A's value is not exact equal to B i am not able to plot my graph. as, A's 2nd value is 1.2233 and B's 2nd value is 1.2234 which is almost equal so i want to put a condition as to search equality till 3rd value after decimal.

please please help me

Best Answer

 AA=floor(A*1000);
 BB=floor(B*1000);
 find(AA==BB),

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MATLAB: How to use fsolve with a system of 2 nonlinear equations in a for that changes a parameter at each iteration

Note: Lots of parameters were not defined so please take care of it.

%%different file
%...

% constant definitions
%...
V=-1:0.01:1;            %%vector of parameters
Cq0=0;                    %initial guess

Vch0=0;                    %initial guess
Roots=cell(1,numel(V));   % preallocate!
for i=1:length(V)
    iterfun=@(x)Fdd(x,V(i));
  Roots{i}=fsolve(iterfun,[Cq0;Vch0]);  % don't name variable as ans
end
celldisp(Roots)
Roots= [Roots{:}] % double array
function F=Fdd(x,V)        %%variables are Cq and Vch, V should be the parameter
    %%...
    %%constants definitions
    %%..
    Cq=x(1);
    Vch=x(2);
    K=6; % your value




    kB=8; % your value
    q=10; % your value
    T=2; % your value 
    Vgstop=3; % your value
    Cox=4; % your value
    F(1)= Cq-(K.*kB.*T).*log(2.*(1+cosh((q.*Vch))./(kB.*T)));
    F(2)= Vch -(Vgstop-V).*(Cox./(Cox+0.5.*Cq));
end

MATLAB: I am plotting the derivative of a curve. Getting the y value for maximum peak height of the biggest peak. But when I try to get the x value corresponding to that y value its not giving me any value. Following is the code. Any help would be apprecia

You can get the position/index of the maximum element from array using max itself. You need not to find the index later.

a = load('ra1.dat');
x = a(:,1);
y = a(:,2);
y_mov_average = filter(ones(1,50)/50,1,y);
plot(x,y);
hold on
dy = diff(y)./diff(x);
dy_mov_average = filter(ones(1,10)/10,1,dy);
plot(x(2:end),dy_mov_average);
PEAKSID = findpeaks(dy_mov_average);
ID = class(PEAKSID);
[PEAKIDCAL,VALUE] = (max(PEAKSID));  % get max and it's index 
% VALUE = find(y==PEAKIDCAL);
xaty = x(VALUE);

Best Answer

Related Solutions

MATLAB: How to use fsolve with a system of 2 nonlinear equations in a for that changes a parameter at each iteration

MATLAB: I am plotting the derivative of a curve. Getting the y value for maximum peak height of the biggest peak. But when I try to get the x value corresponding to that y value its not giving me any value. Following is the code. Any help would be apprecia

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