assign a value to a variable inside if body and call it as a condition in another if statement

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Zubia Mansoor 2019-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/469502-assign-a-value-to-a-variable-inside-if-body-and-call-it-as-a-condition-in-another-if-statement

评论： Zubia Mansoor 2019-6-30

i define variables by using following commands

for i=1:4
    syms H(i) G(i) D(i)
end

and values to thes variables inside body of if statement

for i=1:20
    if .....
            H(1)=1;
        break
    elseif
        continue
    else
        H(1)=0;
    end
end

now i call these variables in another if statement as a condition

if (H(1)==1) && (H(2)==1) && (H(3)==1) && (H(4)==1)
    figure; imshow(B); 
end

this code neither give error nor output. can someone tell me where i am wrong or why it does not give me output.

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Stephen23 2019-6-29

Is there a particular reason why you need to use symbolic variables?

If yes, why not use the symbolic vector syntax shown in the documentation?:

https://www.mathworks.com/help/symbolic/sym.html

Zubia Mansoor 2019-6-30

No, particular reason. I needed to define a variable before using it in if statement. I also try H(i)=0; to initialize it but it still did not give me any output.

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