1x2 Cell with each ?field? containing 2 values

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.

Answer 1

[Ameer Hamza]

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);

[Patrick Petre]

Yes thats how my a looks and how i try to get the variable but it doesnt work in my loop. I did a seperate array just to test it when i put the numbers in manually and that works.

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

a{1,1}(1) ---> gets me 1

a{1,2}(1) ---> gets me 3

If i exchange it with my index for the loop it just stores the last value.

i=2

for 1:i

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

a{1,i}(1)

end

---> only 4, as i want to plot a bar graph it results in just one bar and not two

[Ameer Hamza]

Can you show the actual code for your for-loop. Following shows an example of how to use it in for-loop

a = {[1 2], [3 4]};
v = zeros(size(a));
for i = 1:numel(a)
v(i) = a{1,i}(1);
end
disp(v)

[Patrick Petre]

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

[Ameer Hamza]

Can you attach your actual code with all the relevant variables?