Convert a vector in Character array after a for loop

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luca 2019-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/473280-convert-a-vector-in-character-array-after-a-for-loop

编辑： Stephen23 2019-7-24

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Hi, given the following code

n=length(x)
f = zeros(1,n)
for i = 1:n
if x(i) == 1 
f(1,i) = 22;
elseif x(i)==2
f(1,i) = 23;
elseif x(i)==3
f(1,i)= 21;
elseif x(i)==4
f(1,i) = 23;
elseif x(i)==5
f(1,i)= 24;
end
end
C= char (f)

I don't know why but the 'char' conversion doesn't work giving to me the following

so with nothing inside the vector, that I need later for a switch case.

Do you know how to fix the problem?

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luca 2019-7-24

Probably Char is not the right Command.

What I want to do is. Create a vector f through the for cycle and then use this vector as switch case. The SWITCH expression must be a scalar or a character vector, but in my case f is an array with numeric value. Do you know hot to do?

Stephen23 2019-7-24

编辑：Stephen23 2019-7-24

"I don't know hot to do because I'm a really beginner."

That is okay, we are here to help. But so far you have not actually described what you are trying to achieve: you have not explained how the result/output should be derived from the input, or provided example input and output arrays.

Without a specification we have to rely on guessing what you are trying to achieve.

Forget about code, what are you trying to do ?

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Stephen23 2019-7-24

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Avoiding character manipulations using basic indexing:

>> x = [1,2,3,1];
>> V = 'A':'Z';
>> V(x)
ans = ABCA

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luca 2019-7-24

Sorry may I ask you one more thing?

With basic indexing I have a problem. The fourth value is 1. 1 should be always the case A. But in this case is E. and the code display qwert.

Do you know how to fix in order to have Case A also for the fourth value.

THANKS

Stephen23 2019-7-24

编辑：Stephen23 2019-7-24

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Instead of

switch V(i)

you need

switch V(f(i))

Otherwise you are just iterating over the elements of V, which is unlikely to be useful.

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Matt J 2019-7-24

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Perhaps this is what you want?

>> f=[1,2,3,4], F=char(64+f)
f =
     1     2     3     4
F =
    'ABCD'

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luca 2019-7-24

What I want to do is Create a vector f through the for cycle and then use this vector as switch case. The SWITCH expression must be a scalar or a character vector, but in my case f is an array with numeric value. Do you know hot to do?

Matt J 2019-7-24

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You can loop over the elements of f,

n=length(x)
f = zeros(1,n)
for i = 1:n
 switch f(i)
     
     case 22
         
     case 23
         
     case 24
         
         ...
     
 end
end