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annotate +grid/evalOnScalar.m @ 1037:2d7ba44340d0 feature/burgers1d

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Pass scheme specific parameters as cell array. This will enabale constructDiffOps to be more general. In addition, allow for schemes returning function handles as diffOps, which is currently how non-linear schemes such as Burgers1d are implemented.
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Fri, 18 Jan 2019 09:02:02 +0100
parents 3ea2ae2a3d15
children
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1 % WHAT KIND OF A FUNCTION NAME IS THIS?!
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2 % This functions send matrixa arguments to func unlike grid.evalOn()
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3 % Takes a funciton and evaluates it on a grid to return a grid function in the
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4 % form of a (n*k)x1 vector, where n is the number of grid points and k is the
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5 % number of components of the function.
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6 % g -- Grid to evaluate on.
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7 % func -- Function to evaluate. May be a function handle or a constant. If
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8 % it is a vector value it has to be provided as a column vector,
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9 function gf = evalOn(g, func)
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10 if ~isa(func, 'function_handle')
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11 % We should have a constant.
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12 if size(func,2) ~= 1
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13 error('grid:evalOnScalar:VectorValuedWrongDim', 'A vector valued function must be given as a column vector')
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14 end
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15
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16 gf = repmat(func,[g.N, 1]);
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17 return
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18 end
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19 % func should now be a function_handle
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21 % Get coordinates and convert to cell array for easier use as a parameter
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22 x = g.points();
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23 X = {};
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24 for i = 1:size(x, 2)
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25 X{i} = x(:,i);
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26 end
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28 % Find the number of components
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29 x0 = num2cell(x(1,:));
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30 f0 = func(x0{:});
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31 k = length(f0);
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33 if size(f0,2) ~= 1
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34 error('grid:evalOnScalar:VectorValuedWrongDim', 'A vector valued function must be given as a column vector')
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35 end
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36
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37 gf = func(X{:});
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38 if k > 1 % Reorder so that componets sits together.
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39 gf = reshape(reshape(gf, [g.N, k])', [g.N*k, 1]);
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40 end
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41 end