# Unai San Miguel

### Nordex-ACCIONA

Last seen: 1 year ago Active since 2016

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Optimal knot distribution when specifying interpolating value and derivatives
The length of the knot vector knots should be equal to the length of your [x, x] vector plus the order of the spline, 5 in your ...

3 years ago | 0

Code to plot von mises and tresca yield conditions
This plot can be generated with some analytic work, by getting the ellipse in parametric equations, generating points along tha...

4 years ago | 0

Scattered interpolation with weight factors
You could add some random points near the point you rely more on. Close enough to effect the interpolation and separated enough ...

4 years ago | 0

curve fitting toolbox: how to fit a multivariate b spline to data (regression)
I think it is the same as for the d=1 case: you have to define a convenient knot sequence, and in turn a spline vector space, an...

5 years ago | 0

With the Nurbs2IGES toolbox found in MATLAB File Exchange https://www.mathworks.com/matlabcentral/fileexchange/12087-nurbs2iges ...

5 years ago | 0

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N-Dimensional smoothing spline weighting
You can use a cell of two set of weights, one in each direction of the input csaps({1:M, 1:N}, I, [], {wi, wj}); with wi an ...

5 years ago | 0

How can I represent and visualize my four dimensional system in a meaningful way?
3 dimensions are really hard to plot, it is almost always better to switch to 2D, and better contours than filled contours. If y...

5 years ago | 0

how can i work with the coefs of cscvn?
There is no need to use the coefficients of the function, because the Curve Fitting Toolbox provides with functions to derive an...

6 years ago | 1

Error finding and graphing max values of data (Error using horzcat Dimensions of matrices being concatenated are not consistent. )
Your |TEK00055.csv| data has three data points with maximum y-values: >> xmax xmax = 6.8720 6.8730 6.9890...

6 years ago | 0

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multidimensional numerical integration without large matrices
I don't like |meshgrid| even for 2 variables, so I would use |ndgrid| instead [X1, X2, X3, X4] = ndgrid(x1, x2, x3, x4); ...

6 years ago | 0

'stacking' 2D graphs on top of each other.
There are |plot3|, |contour3| versions of |plot|, |contour| for which you would have to add a third coordinate for each 2D plot,...

6 years ago | 0

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How to plot sin(theta)*cos(phi) in spherical coordinates
|sin(theta) * cos(phi)| is the result of the matrix multiplication of the two terms. Maybe you wanted |sin(theta) .* cos(phi)|? ...

6 years ago | 0

difficulty in printing for 'cell' inputs.
If you are OK with the contents and format of |c| maybe you can substitute the |fprintf| line by: cellfun(@(x) fprintf(fid2...

6 years ago | 0

How do i find the intersection points between a surface and a patch?
It is hard to find the intersection of a surface and a plane (in general), as it is explained <http://web.mit.edu/hyperbook/Patr...

6 years ago | 0

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Solved

Angle between two vectors
You have two vectors , determine the angle between these two vectors For example: u = [0 0 1]; v = [1 0 0]; The a...

6 years ago

Calling multiple function files to plot in one figure
Although I don't know exactly what kind of plots you want to do, or what are the variables involved, sometimes it helps to use t...

6 years ago | 0

Constructing an Offset-Curve
The subject is not trivial, a nice description can be found in <http://web.mit.edu/hyperbook/Patrikalakis-Maekawa-Cho/node210.ht...

7 years ago | 0

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How to display the contour line values from a contour plot generated using the curve fitting tools?
If, in the auto-generated code from the gui you specify |h| (the handler to the plots) as an aditional output variable you can a...

7 years ago | 0

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Revolution 2D spline to 3D surface
It depends on what you mean by _analytical expression_. For example, it is not possible to express a circle and thus a revolutio...

7 years ago | 0

fnval for tensor splines
|fnval(pp, [x(:)'; y(:)'])|? From the <https://es.mathworks.com/help/curvefit/fnval.html fnval> doc page (...) For an m...

7 years ago | 0

Fit polynomial to data with prescribed second derivative
The <http://es.mathworks.com/help/curvefit/csape.html help page for csape> says that you would have to use |csape(x, [-0.001, y,...

7 years ago | 0

Closed spline fit of airfoil coordinates
You are working with curves, not functions. Your |airfoil| is a (planar) curve, or in the Splines toolbox wording a 2-valued...

7 years ago | 0

Question

jupyter notebook vs live scripts
What are the differences between Live Scripts and Jupyter notebooks?

7 years ago | 3 answers | 3

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Storing the output of spap2 into an array then looping and graphing that output
The output of |spap2| is a struct, something like: >>sp sp = form: 'B-' knots: [1x25 double] ... ...

7 years ago | 0

statistics (PCA) on piecewise B spline for Shape Model problem using spline toolbox
|fncmb| takes first both spline functions to the same vector space (same breaks and order in this case). If the breaks are not t...

7 years ago | 0

B-Spline least squares (spap2)
Hi, |spap2| returns the B-form of the spline, and if you don't supply a knot vector it will use C2 continuity (k-2 = 4-2 in y...

7 years ago | 0

Question

What is the best way to remove a knot from a (univariate) spline?
In my problem, I have a planar curve, i.e., a 2-valued univariate spline function |s|. I insert |k-1| times a value in the knot ...

8 years ago | 0 answers | 0