MATLAB: How to extract the exponential term

extracting the exponent valueMATLAB

If I am having a number like 1.2346e+02 ,then I want to print only the exponent value (i.e. 02) as a result. How can I do this.Please anyone help me with this.

Best Answer

Here is one way;

floor(log10(1.2346e+02))

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MATLAB: How to compute fourier coefficient

f = fft(yourSignal);
f20 = f(1:20); % Extract first 20 coefficients.

MATLAB: 3-term exponential fit

I don’t have the Curve Fitting Toolbox (Optimization and Statistics instead). This uses fminsearch:

y = @(b,x) b(1).*exp(-b(2).*x) + b(3).*exp(-b(4).*x) + b(5).*exp(-b(6).*x);
p = [3; 5; 7; 11; 13; 17]*1E-1;             % Create data
x  = linspace(1, 10);
yx = y(p,x) + 0.1*(rand(size(x))-0.5);
OLS = @(b) sum((y(b,x) - yx).^2);           % Ordinary Least Squares cost function
opts = optimset('MaxFunEvals',50000, 'MaxIter',10000);
B = fminsearch(OLS, rand(6,1), opts);       % Use ‘fminsearch’ to minimise the ‘OLS’ function
fcnfit = y(B,x);                            % Calculate function with estimated parameters
figure(1)
plot(x, yx, '*b')
hold on
plot(x, fcnfit, '-r')
hold off
grid

Best Answer

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MATLAB: How to compute fourier coefficient

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