using the vector as a condition in the switch statement

Question

surendra kumar Aralapura mariyappa 2019-6-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466214-using-the-vector-as-a-condition-in-the-switch-statement

回答： Walter Roberson 2019-6-9

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hey, I need to know how to pass row vector or column vector as a condition to a switch statement.

I have two row vectors;

function [M,A] = my_vectors
M = [ 1 3 5 9 8 11 12 13 15 17 20 25 29 31.......];
A = [ 2 4 7 6 10 14 16 19......... ];
end

I need my slover like below:

function my_switch 
[M,A] = my_vectors;
for i = 1:n
switch true 
case M
 statement;
case A 
statement
end
end

Here I know we can use multiple conditions in switch statement like below;

Switch true
case { 1, 3, 5, 9, 8}
statement;
case { 2, 4, 6, 7}
statement;
end

But I need to use a n vecotr as a condition in the switch statement since row vector function is being called in the slover(main function).

Here I don't need to enter the number each time to check the number isnumber(b,a) whether the number is there in the vector M or A to exceute the statement like below.

switch true
case ismember(b,M)
statement;
case ismember(b,A)
statement;
end

if there is any wrong in my code plz write the comment section along with the answer for my problem.

any suggestion are most welcomed and thanks in advance.

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surendra kumar Aralapura mariyappa 2019-6-9

编辑：surendra kumar Aralapura mariyappa 2019-6-9

在 MATLAB Online 中打开

@Adam Danz, Thank you for the quick response.

In your code, again you did what I knew, I mean like this,

cases = {[1 2 3 4 5]; [2 4 6 8]; [9 6 3];........};

But I need to pass the vector A direclty as a condition like this A(:)

switch true
case A(:)     % wrong synatx may be
statement
case M(:)
statement
end

I don't need to do any thing in the switch function file(solver), only I hvae to change the condition in the matrix file I mean vectors. Automatically those changed vecotrs should be conditions in the slover as I explained early.

In my question, I included for loop which means a particluar statement will be executed many times

for an example :

M = [ 1 3 5 9 8 11 12 13 15 17 20 25 29 31];
A = [ 2 4 7 6 10 14 16 19 ];
%Please note Vectors M and N will be n numbers like 
%M = [ 1 3 5 9 8 11 12 13 15 17 20 25 29 31................];
for i = 1:n
switch true
case A(:)
statement1
case M(:)
statement2
otherwise
disp('not a number')
end
end

Statement1 will be executed 8 times whenever the value of i is same as the value of vector A. Same for the statement1 and its condition M.

Please read my question once again, if you still didn't understand I will explain it deeply.

Thanks

surendra kumar Aralapura mariyappa 2019-6-9

在 MATLAB Online 中打开

I understood now. I will take your idea oly now

for i = 1:n
switch i 
case i == A(:)
statement1;
case i == M(:)
statement2
otherwise
statement3
end
end

is this correct now?

surendra kumar Aralapura mariyappa 2019-6-9

编辑：surendra kumar Aralapura mariyappa 2019-6-9

在 MATLAB Online 中打开

function my_idea
A = [ 1 2 5 7 ];
n = 8;
M = [ 3 4 6 9];
for i= 1:n
    switch i
        case i == A(:)
            disp('suri');
        case i == M(:)
            disp('kumar')
        otherwise
            disp('error')
    end
end
end

still it not working when I tested i also. Kindly help in that at least!

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Answer 1

Walter Roberson 2019-6-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/466214-using-the-vector-as-a-condition-in-the-switch-statement#answer_378450

在 MATLAB Online 中打开

function my_idea
A = [ 1 2 5 7 ];
n = 8;
M = [ 3 4 6 9];
for i= 1:n
    switch i
        case num2cell(A)
            disp('suri');
        case num2cell(M)
            disp('kumar')
        otherwise
            disp('error')
    end
end
end