MATLAB: How to find argument value

argumentfunctionvaluevector

Hi, I have a, b vectors and rectangular grid made of them, I write a function and obtain function values on grid. How can I find which values of 'a' and 'b' vectors correspond to particuar function value? Here's the code…

a= [1,2]
b=[3,4]
[m,n]=ndgrid(a,b)
x=[m(:),n(:)]
u = @(a, b)(a.^2+b)
g=(u(x(:,1),x(:,2)).')

Code gives me g=4,7,5,8 values…. I want to know for example which values of 'a' and 'b' created g=7 value. Thanks.

Best Answer

mng  = [m(:), n(:), g(:)];
ab_at_g = mng(ismember(mng(:,3),7),1:2)

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MATLAB: Dimensions of matrices being concatenated are not consistent

Because E is a column vector, not a row vector like you're building with all the rest of the numbers, you must transpose E:

A=2
B=3
C=4
D=5
E=[1; 0.1; 0.9]
F = [A, B, C, D, E']

so now F is a row vector. Or else use semicolons and don't transpose E:

A=2
B=3
C=4
D=5
E=[1; 0.1; 0.9]
F = [A; B; C; D; E]

so now F is a column vector.

MATLAB: How to reorder cell array columns based on the order of a vector matrix, while keeping rows intact in Matlab

Would this work?

 >> buffer = arrayfun(@(rId) data(rId,order(rId,:)).', 1:size(order,1), ...
                      'UniformOutput', false) ;
 >> reordered_data = [buffer{:}].'
 reordered_data = 
    'B'    'B'    'B'    'B'    'B'    'A'    'A'    'B'
    'B'    'B'    'A'    'B'    'A'    'A'    'A'    'A'
    'A'    'A'    'B'    'A'    'A'    'B'    'B'    'B'
    'A'    'A'    'A'    'A'    'B'    'A'    'A'    'A'

Best Answer

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MATLAB: Dimensions of matrices being concatenated are not consistent

MATLAB: How to reorder cell array columns based on the order of a vector matrix, while keeping rows intact in Matlab

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