MATLAB: Extraction analytical eqution from interpolant fitting

curve fittingMATLAB

How can i extract analytical equation from cfit, when i use interpolant fitting (e.g. cubic spline)?

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When you asked this question about a day ago, you wrote in terms of "symbolic" expression rather than analytical expression.

To answer your question you are going to need to describe the form of analytical equation you need. cubic splines are inherently defined piece-wise, so there is not going to be a single equation unless you start using piecewise() or heaviside() or similar.

You should have a look at http://www.mathworks.com/help/matlab/ref/unmkpp.html

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MATLAB: Solve an eqution in matlab

D(t)=R_t
<=> D(t)-R_t=0

use fzero

tSolution=fzero(D(t)-R_t,0)

but care, the output can be contain more than 1 solution, if D and R have more than 1 intersection point

MATLAB: Find the area with equtions

You can use the symbolic toolbox to attempt a closed-form integration if you command

syms x

However, you are probably expected to use numeric integration, which uses integral() of a function handle, not int() with a formula.

Also, for numeric work you need to use .^ instead of ^

   y = integral( @(x) (sqrt (1 - ( x - x2 ).^2)) , x0 , x1);

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MATLAB: Solve an eqution in matlab

MATLAB: Find the area with equtions

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