Cellfun or for loop
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Atreyu91
le 26 Août 2015
Réponse apportée : Guillaume
le 26 Août 2015
I have the following code where I am trying to obtain U for every k value and the values in a cell array:
G = 1x3 cell
If
G{1,1} = [-6.45230249676815e-06;
2.43528862745912e-20;
2.00553181084869e-19;
6.45309629402509e-06;
-9.16814514353228e-20;
6.45627245974903e-06]
G{1,2} = [-3.22654814674929e-06;
-5.38986674121538e-20;
-2.25622328702039e-20;
3.22734209049890e-06;
-2.25622301386590e-20;
3.23051981960359e-06]
G{1,3} = [-2.15129672917826e-06;
-2.05328256780239e-20;
-6.68510603470547e-21;
2.15209081944770e-06;
-6.68510421367576e-21;
2.15527011276720e-06]
and
k = 0.0012
k = 0.0025
k = 0.0037
L1 = 0.1
L2= 0.2
L3 = 0.4
U1 = G(1)*exp(-k*L1)+G(2)*exp(-k*L1);
U2 = G(3)*exp(-k*L1)+G(4)*exp(-k*L1);
U3 = G(5)*exp(-k*L1)+G(6)*exp(-k*L1);
I need to obtain U1,U2,U3 for each value of k
I have tried using for loops and cellfun() etc.
U1 = cellfun(@(G, k) G(1)*exp(-k*L1)+G(2)*exp(-k*L1), G, k, 'UniformOutput', 0);
but it keeps saying "Error using cellfun Input #3 expected to be a cell array, was double instead."
Can anyone please show me how to perform this in MATLAB?
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Réponse acceptée
Walter Roberson
le 26 Août 2015
Your description is unclear. One interpretation is that you want
nG = length(G);
kvals = [0.0012 0.0025 0.0037];
nk = length(kvals);
L = [0.1 0.2 0.4];
U = zeros(nk, nG);
for Gidx = 1 : nG
g = G{Gidx};
for kidx = 1 : nk
k = kvals(kidx);
U(kidx, Gidx) = g(2*kidx-1)*exp(-k*L(kidx)+g(2*kidx)*exp(-k*L(kidx));
end
end
but another possibility is that you want all combinations of L used with all combinations of k rather than corresponding L used with each k.
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Guillaume
le 26 Août 2015
k = 0.0012
k = 0.0025
k = 0.0037
One would assume that's not what you've entered in matlab (since that would result in just k = 0.0037) but something else. For your cellfun to work, you'd have to have written k as a cell array:
k = {0.0012; 0.0025; 0.0037};
The error is clear your third input (k) is not a cell array.
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