1x2 Cell with each ?field? containing 2 values

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Patrick Petre 2020-11-27

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评论： Ameer Hamza 2020-11-29

I have a Cell called "a" which is 2x1.

so from "a" to "a{1,1}" and "a{1,2}"

Each ?field? correct me pls if this is not the right term. contains 2 values.

How can i extract the first value of both fields? If i try t = a(1,1) it gives me both values but i jsut want the first one.

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Ameer Hamza 2020-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/665453-1x2-cell-with-each-field-containing-2-values#answer_557973

编辑：Ameer Hamza 2020-11-27

在 MATLAB Online 中打开

You have 'a' like this

a = {[1 2], [3 4]};

To access first elemets, you need to use indexing like this

a{1,1}(1)
a{1,2}(1)

If you want to extract all the first elements, then you will need to use a loop

v = zeros(size(a));
for i = 1:numel(a)
    v(i) = a{1,i}(1);
end

The above for-loop can be simplified using cellfun()

v = cellfun(@(x) x(1), a);

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Patrick Petre 2020-11-28

编辑：Patrick Petre 2020-11-28

okay. it is a bit weird bc now it worked with my example, but not with my bar plot. it just plots me p{1,2}(1). p and xxx are basically the same with different values, so i dont understand why it doesnt work (Inside my loop i fit a curve to a set of data which is my p)

for i = 1:number (number being 2)

p{i} = polyfit(x_relevant{i}, y_relevant{i},1)

subplot(4,1,4)

b(i) = bar(p{1,i}(1),'FaceColor',c{i})

hold on

xxx = {[1 2], [3 4]}

x222(i) = xxx{1,i}(1)

end