MATLAB: How to find x data in a interpolate curve

curve fittingCurve Fitting Toolbox

Hello everybody,

how can I find the data of x related to y on a curve interpolated data for x and y?

wanted to find the time for example regarding the flow accumulated 2867.04.

function

https://docs.google.com/file/d/0B9JmyPHF_ZMPMmtGV3hNMnpkUjg/edit?usp=sharing

date

https://docs.google.com/file/d/0B9JmyPHF_ZMPTzdlUHlibjFzRzg/edit?usp=sharing

Best Answer

f2 = @(y)fzero(@(x)fitresult(x)-y,0);
out = f2(2867.04);

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MATLAB: Fitting a single amplitude sine wave to known peak/trough points

I solved this problem by taking each location of a peak, using linspace to create the numbers 90-180 (as many numbers as I had time data points) between the peak and the next trough, then I did the same for between the trough and the next peak (180-270) and that peak and the next trough (270-360) and from that trough onto the next peak (360-450).

Then I subtracted 360 from any number over 360 to make all the values range from 0-360 in a correct sin function.

MATLAB: Distribution graph velocity : how to make simple paraboloid of revolution

hi,

i think your method works for this type of problems, try :

 N=40;         % Discretization
 Vmax=20;      % 20m/s
 xc=0;
 yc=0;
 zc=0;
 R=0.5;        %  radius of the tube
 [x,y,z]=ellipsoid(xc,yc,zc,R,R,Vmax,N);
 z(z<0)=0;     %  trick to truncate the unwanted elements
 figure, surf(x,y,z), shading interp
 xlabel('X axis (m)');
 ylabel(' Y axis (m)');
 zlabel(' Velocity (m/s)');
 title(' Velocity profile');

Best Answer

Related Solutions

MATLAB: Fitting a single amplitude sine wave to known peak/trough points

MATLAB: Distribution graph velocity : how to make simple paraboloid of revolution

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