How to create a vector out of arrays

Given the Following arrays:

Header = ('A' 'B' 'C' 'D')
Data1 = ( 1 2 3 4)
Data2 = (5,6,7,8)

I want to create the following Vectors:

A = (1 ,5)
B = (2, 6)
C = (3, 7)
D = (4, 8)

My attempt was this: for I = 1:length(Header) NewVector = [Header(i), ' = [Data1(i) Data2(i)]']; eval(NewVector); end

My error is: Undefined function 'eval' for input arguments of type 'cell'.

Help?

Answer 1

[José-Luis]

Header = {'A' 'B' 'C' 'D'};
Data1 = [1 2 3 4];
Data2 = [5,6,7,8];

cnt = 1;
for ii = Header
    assignin('base',ii{:},[Data1(cnt) Data2(cnt)]);
    cnt = cnt + 1;
end

This is a bad idea though, you'd be better off storing in a cell array instead of dynamically creating variables.

[Erica]

Yes! This is perfect! I understand why you think this is a bad idea, but I have a purpose behind my madness. Thanks!!

[José-Luis]

Fair enough. Glad to help.

Answer 2

[Ben11]

Try this:

clear all
clc

Header = {'A' 'B' 'C' 'D'};

Data1 = [1 2 3 4];

Data2 = [5,6,7,8];

NewVector = cell(1,numel(Header));
for i = 1:numel(Header)

      NewVector{i} = sprintf('%s = (%i,%i)',Header{i},Data1(i),Data2(i));

end

NewVector

NewVector =

Columns 1 through 3

    'A = (1,5)'    'B = (2,6)'    'C = (3,7)'

Column 4

    'D = (4,8)'

Now each cell of the NewVector cell array contains what you want.

I must say that your question was not that clear so if it's not what you are looking for please don't hesitate to ask for details/clarify your question. For instance do you want every element to literally contain a letter with an equal sign and then a pair of numbers, or simply the pair of numbers? If so then you would not have to use cell arrays.

[Erica]

Yeah - I had trouble wording what I was after ... Yes, I literally want a Vector Named A and to have it's contents be 1 and 5 so that I can access A(0) and get 1 or A(1) and get 5... Do you see what I mean??

Answer 3

[James Tursa]

I am guessing that Header is a cell array of strings, even though you have typed it in your post using parentheses ( ) instead of curly braces { }. If that is the case, try this instead using curly brace {i} instead of parentheses (i):

 [Header{i}, ' = [Data1(i) Data2(i)]']

I.e., use the curly braces to extract the string from Header before combining with the rest of the string. That way you will get a string result instead of a cell result.

Advice: In the future, post your exact code so people can have a chance to correct your syntax. By using parentheses ( ) in your post instead of the exact code { } and [ ], you unintentionally mislead the readers.

Answer 4

[Azzi Abdelmalek]

This is not a good idea.

Data1 = [1 2 3 4]
Data2 =[5,6,7,8]

Just create one variable

A=[Data1' Data2']

Look at this link http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F