Inverse of a cell array

Question

MarshallSc 2021-7-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/873313-inverse-of-a-cell-array

回答： the cyclist 2021-7-6

Hello, I'm trying to get the inverse values of a 10*10 cell array, each containing a 4*4 matrix. The code is (credit to Stephen Cobeldick for the code):

x1 = rand(10,10);
y1 = rand(10,10);
z1 = rand(10,10);
r1 = rand(10,10);
a1 = cat(3,x1,y1,z1,r1);
x2 = rand(10,10);
y2 = rand(10,10);
z2 = rand(10,10);
r2 = rand(10,10);
a2 = cat(4,x2,y2,z2,r2);
tmp = num2cell(sqrt(a1./a2),3:4);
fun = @(a)reshape(a,4,4);
out = cellfun(fun,tmp,'uni',0);

Now I want the inverse of the results (1/values). I used some commands but the results are not accurate. For example using:

out2=cellfun(@inv, out, 'uniform', 0);

But the results are not correct. Is there any method that can calculate the inverse of the cell array? Thank you.

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Answer 1

the cyclist 2021-7-6

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/873313-inverse-of-a-cell-array#answer_741233

在 MATLAB Online 中打开

Do you mean you want the reciprocal of each element of each matrix? (That is not what the inverse of a matrix means.)

If so, then you want

x1 = rand(10,10);
y1 = rand(10,10);
z1 = rand(10,10);
r1 = rand(10,10);
a1 = cat(3,x1,y1,z1,r1);
x2 = rand(10,10);
y2 = rand(10,10);
z2 = rand(10,10);
r2 = rand(10,10);
a2 = cat(4,x2,y2,z2,r2);
tmp = num2cell(sqrt(a1./a2),3:4);
fun = @(a)reshape(a,4,4);
out = cellfun(fun,tmp,'uni',0);
out2=cellfun(@(x) 1./x, out, 'uniform', 0);
% example of one reciprocal:
out{1}
ans = 4×4
    0.5451    0.3943    0.6951    0.5691
    1.1282    0.8162    1.4386    1.1779
    0.1688    0.1221    0.2152    0.1762
    0.7559    0.5469    0.9639    0.7893
out2{1}
ans = 4×4
    1.8345    2.5359    1.4387    1.7571
    0.8864    1.2252    0.6951    0.8490
    5.9252    8.1905    4.6467    5.6751
    1.3228    1.8286    1.0374    1.2670