Varying parameters in if statement

Question

ericson 2014-3-9

0
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编辑： Mischa Kim 2014-3-9

Hi! I would like to create a conditional statement where the parameters of my if statement is changing. Is it possible to vary the parameters in the if statement?

Here is an example:

x10=1;

i=10;

word='x';

if ('%s%d~=1',word,i)

v='not working'

end

I tried this one but it is not working, any suggestion on how to make it work?

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Answer 1

the cyclist 2014-3-9

1
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Here is the closest I can get to the code that I think you wanted:

x10=1;
i=10;
word='x';
% Create a "pass/fail" variable that will be tested.
eval(sprintf('PF = %s%d~=1;',word,i))
% Do the test
if PF
    v = 'not working'
end

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ericson 2014-3-9

Yes, both the variable and digit vary

Is there an alternative way wherein I don't need to store it to another variable? I'm using this code for my GUI wherein I will need that code to compare to almost 3000 variables. If I add more variables, it will make the real time clock in my GUI hang.

the cyclist 2014-3-9

在 MATLAB Online 中打开

x10=1;
i=10;
word='x';
% Create a "pass/fail" variable that will be tested.
eval(sprintf('if %s%d~=1, v = ''not working''; disp(v); end ',word,i))

If you don't actually need to display the 'not working' text, then you can get rid of the

disp(v)

statement inside the eval() statement.

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Answer 2

Mischa Kim 2014-3-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/120758-varying-parameters-in-if-statement#answer_127596

编辑：Mischa Kim 2014-3-9

在 MATLAB Online 中打开

Something like:

 mynum = 2;   % change to mynum = 1   
 x10   = 1;
 word  = 'x';
 i     = 10;
 if (eval(genvarname(strcat(word,num2str(i)))) == mynum)
    fprintf('x10 is %d\n', mynum);
 else
    fprintf('x10 is not %d\n', mynum);
 end

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ericson 2014-3-9

Is there an alternative way wherein I don't need to store it to another variable? I'm using this code for my GUI wherein I will need that code to compare to almost 3000 variables. If I add more variables, it will make the real time clock in my GUI hang.

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