How to concatenate 5x2 array output from my function?

I'm using a function to perform some data manipulation across 5 datasets. The data is cyclic voltammetry, so basically rectangles with x and y values. My function is outputting the values I want into a 5x2 array which works fine for single input. I want to use a for loop to have multiple inputs and have the output of the for loop in a single tall Yx2 array. currently, my 5x2 output is simply being overwritten every iteration.

How can I make sure that each iteration is stored in the same array so that it grows over the course of the for loop?

function Currents = Dunn(data1, data2, data3, data4, data5, potential, tolerance)

%Find the values near specified potential value. This step is needed since my data does not have 0.6, 0.61, 0.62...

%so I needed to use a net around the chosen value.

A = data1(:,1)>(potential -abs(potential)*tolerance) & (potential + abs(potential)*tolerance) > data1(:,1);

B = data2(:,1)>(potential -abs(potential)*tolerance) & (potential + abs(potential)*tolerance) > data2(:,1);

C = data3(:,1)>(potential -abs(potential)*tolerance) & (potential + abs(potential)*tolerance) > data3(:,1);

D = data4(:,1)>(potential -abs(potential)*tolerance) & (potential + abs(potential)*tolerance) > data4(:,1);

E = data5(:,1)>(potential -abs(potential)*tolerance) & (potential + abs(potential)*tolerance) > data5(:,1);

%initiate placeholder vectors that will later be concatenated.

placeholderA = [];

placeholderB = [];

placeholderC = [];

placeholderD = [];

placeholderE = [];

%initiate counters for the for loops

a = 1;

b = 1;

c = 1;

d = 1;

e = 1;

%Identify max y-axis value at specified 'potential' (x-axis) value for each dataset.

for i = 1:length(data1)

if A(i,1) > 0

placeholderA(a,1) = data1(i,1);

placeholderA(a,2) = data1(i,2);

a = a+1;

end

end

for i = 1:length(data2)

if B(i,1) > 0

placeholderB(b,1) = data2(i,1);

placeholderB(b,2) = data2(i,2);

b = b+1;

end

end

for i = 1:length(data3)

if C(i,1) > 0

placeholderC(c,1) = data3(i,1);

placeholderC(c,2) = data3(i,2);

c = c+1;

end

end

for i = 1:length(data4)

if D(i,1) > 0

placeholderD(d,1) = data4(i,1);

placeholderD(d,2) = data4(i,2);

d = d+1;

end

end

for i = 1:length(data5)

if E(i,1) > 0

placeholderE(e,1) = data5(i,1);

placeholderE(e,2) = data5(i,2);

e = e+1;

end

end

%concatenate the max y-value for each placeholder array into the output of the function as a 5x2 array.

Currents = [max(placeholderA);max(placeholderB);max(placeholderC);max(placeholderD);max(placeholderE)];

In my .m file I call the function with:

i = 0.5;

for n = 1:100

Currents = Dunn(mvs10, mvs30, mvs60, mvs100, mvs200, i, 0.01)

i = i +0.005

end

Answer 1

[Rik]

This should already get you most of the way there:

i = 0.5;
for n = 1:100
Currents{n} = Dunn(mvs10, mvs30, mvs60, mvs100, mvs200, i, 0.01);
i = i +0.005;
end

[Mitchell Barclay]

I managed to get it working.

I brute forced it a bit and changed by function output to be five arrays which I then concatenated after the use of the function.

I used your advice @Rik and the created array works well.

[Rik]

Glad to be of help. If I solved the problem, please consider marking my answer as accepted answer. If you have any further questions, feel free to comment.