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Siyi's metaphysical stuff

Wednesday, March 17, 2010. Matlab: operate on matched dimension with different shaped matrices. Q: Suppose I have. I want calculate the product between every column of a and b. Is there a vectorized way of this loop:. P = zeros(3,6);. For k1 = 1:3. For k2 = 1:2. P(:,c) = a(:,k1).*b(:,k2);. M,n] = size(a);. P = bsxfun(@times,reshape(a,[m 1 n]),b);. P = reshape(p,n,[]);. Permute(a,[1 3 2]). Has the same effect as reshape(a,[m 1 n]). Tuesday, March 09, 2010. To another orthonormal Cartesian basis cf2. Howev...

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Siyi's metaphysical stuff | siyideng.blogspot.com Reviews

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Wednesday, March 17, 2010. Matlab: operate on matched dimension with different shaped matrices. Q: Suppose I have. I want calculate the product between every column of a and b. Is there a vectorized way of this loop:. P = zeros(3,6);. For k1 = 1:3. For k2 = 1:2. P(:,c) = a(:,k1).*b(:,k2);. M,n] = size(a);. P = bsxfun(@times,reshape(a,[m 1 n]),b);. P = reshape(p,n,[]);. Permute(a,[1 3 2]). Has the same effect as reshape(a,[m 1 n]). Tuesday, March 09, 2010. To another orthonormal Cartesian basis cf2. Howev...

<META> KEYWORDS

1 siyi's metaphysical stuff

2 note

3 but reshape

4 is much faster

5 posted by

6 siyi

7 1 comment

8 given cf2in1

9 in cf1

10 suppose

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siyi's metaphysical stuff,note,but reshape,is much faster,posted by,siyi,1 comment,given cf2in1,in cf1,suppose,orthonormality requires that,some numeric examples,or equivalently,first express v,next express vin1,in cf3,thus,no comments,a vector a,define

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Siyi's metaphysical stuff | siyideng.blogspot.com Reviews

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Wednesday, March 17, 2010. Matlab: operate on matched dimension with different shaped matrices. Q: Suppose I have. I want calculate the product between every column of a and b. Is there a vectorized way of this loop:. P = zeros(3,6);. For k1 = 1:3. For k2 = 1:2. P(:,c) = a(:,k1).*b(:,k2);. M,n] = size(a);. P = bsxfun(@times,reshape(a,[m 1 n]),b);. P = reshape(p,n,[]);. Permute(a,[1 3 2]). Has the same effect as reshape(a,[m 1 n]). Tuesday, March 09, 2010. To another orthonormal Cartesian basis cf2. Howev...

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Siyi's metaphysical stuff: Geometry in 3D: dot, cross, norm

http://siyideng.blogspot.com/2010/03/geometry-in-3d-dot-cross-norm.html

Tuesday, March 09, 2010. Geometry in 3D: dot, cross, norm. First we define some utility functions;. Torow = @(x)(x(:).');. Tocol = @(x)(x(:) ;. L2, Euclidean) of a vector is a scalar defined as. Norm(a) = sqrt(sum(a. 2) = sqrt(torow(a)*tocol(a) = sqrt(dot(a,a) ;. Of two vectors is a scalar,. Dot(a,b) = sum(a.*b) = torow(a)*tocol(b);. Of two vectors is a vector orthogonal to both, following the right hand rule:. Cross(a,b) = ([a(2)*b(3)-a(3)*b(2),. A(1)*b(2)-a(2)*b(1)]); % each row corresponds to an axis;.

2

Siyi's metaphysical stuff: Matlab: indexing by two bounds

http://siyideng.blogspot.com/2010/02/matlab-indexing-by-two-bound-vectors.html

Thursday, February 25, 2010. Matlab: indexing by two bounds. Q: Suppose I have an array. And two index bound vectors. I1 = [3 6 11 15];. I2 = [5 9 12 19];. I want to index the elements between i1(k). Is [4 7 8 16 17 18]. Index1 = cell2mat(arrayfun(@(x,y)(x 1:y-1),i1,i2,'uni',false) ;. S = (i2-i1) 1;. X = zeros(size(v) ;. X(i1(s) 1) = 1;. X(i2(s) = -1;. Index2 = logical(cumsum(x) ;. Subscribe to: Post Comments (Atom). View my complete profile. Matlab: indexing by two bounds. Matlab: ismember in every row.

3

Siyi's metaphysical stuff: Matlab: optimization

http://siyideng.blogspot.com/2009/07/matlab-optimization.html

Saturday, July 25, 2009. Is there a way to optimize this for loop? For i = 1:n. For j = i 1:n. Z = y(i) - y(j) ;. Yy = meshgrid(y);. F = sum(sum( yy - yy.'). 2) ;. Assuming y is column vector:. F = 2*( n 1)*sum(y. 2)-2*cumsum(y')*y);. A little bit explanation:. Y = [y1 y2 y3 y4]. Y1-y2). 2 (y1-y3). 2 (y1-y4). 2. Y2-y3). 2 (y2-y4). 2. Y1y1 y2y2-2*y1y2 y1y1 y3y3-2*y1y3 y1y1 y4y4-2*y1y4. Y2y2 y3y3-2*y2y3 y2y2 y4y4-2*y2y4. Y4y4 y4y4 y4y4 - 2*(. Y1y2 y1y3 y1y4 y2y3 y2y4 y3y4. 3*sum(y. 2) - 2*(.

4

Siyi's metaphysical stuff: July 2009

http://siyideng.blogspot.com/2009_07_01_archive.html

Monday, July 27, 2009. Matlab: grouping values according to ID. See also this post. If we have n x 2 matrix x:. X = [11 19; 11 29; 10 34; 7 189; 6 123; 11 18; 21 182; 3 171; 6 145; 7 111]. Where the first column specifies the group ID and we want to break up the 2nd column into a cell array according to the grouping ID. The desired output is:. C = {[171]; [145; 123]; [189; 111]; [34]; [18; 29; 19]; [182]}. U,dump,g] = unique(x(:,1). C = accumarray(g,x(:,2),[length(u),1],@(x){x}). For instance, how to find.

5

Siyi's metaphysical stuff: Matlab: column circshift by each row

http://siyideng.blogspot.com/2010/03/matlab-column-circshift-by-each-row.html

Monday, March 08, 2010. Matlab: column circshift by each row. Is a triangular mesh, f. Is the face list, v. Is the vertex list;. For some vertex k. I have the info of its neighboring faces va. Which is an index into f. Fva = f(va,:). Matrix about vertices involved in va. Is present in every row of fva. I want to re-arrange columns in fva. Row by row, so that vertex k. Is always in the first column, while the rotation order of vertices (clockwise,cc) is retained for each row. Set up the data;.

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Siyi's metaphysical stuff

Wednesday, March 17, 2010. Matlab: operate on matched dimension with different shaped matrices. Q: Suppose I have. I want calculate the product between every column of a and b. Is there a vectorized way of this loop:. P = zeros(3,6);. For k1 = 1:3. For k2 = 1:2. P(:,c) = a(:,k1).*b(:,k2);. M,n] = size(a);. P = bsxfun(@times,reshape(a,[m 1 n]),b);. P = reshape(p,n,[]);. Permute(a,[1 3 2]). Has the same effect as reshape(a,[m 1 n]). Tuesday, March 09, 2010. To another orthonormal Cartesian basis cf2. Howev...

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