How to create a vector out of arrays

Question

Erica 2014-7-15

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https://ww2.mathworks.cn/matlabcentral/answers/141968-how-to-create-a-vector-out-of-arrays

评论： José-Luis 2014-7-15

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?

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Answer 1

José-Luis 2014-7-15

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在 MATLAB Online 中打开

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.

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Erica 2014-7-15

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 2014-7-15

Fair enough. Glad to help.

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Answer 2

Ben11 2014-7-15

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编辑：Ben11 2014-7-15

在 MATLAB Online 中打开

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.

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Erica 2014-7-15

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??

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Answer 3

James Tursa 2014-7-15

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https://ww2.mathworks.cn/matlabcentral/answers/141968-how-to-create-a-vector-out-of-arrays#answer_145251

编辑：James Tursa 2014-7-15

在 MATLAB Online 中打开

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.