How can I override a value with an input?

Question

Andrew 2014-8-8

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回答： Geoff Hayes 2014-8-8

I have a list of variables with values, but I want to be able to override one of those values with an input. To demonstrate:

function [output] = test(variable, value)
  x = 2;
  y = 3;
  q = 10;
end

And let's say my input is (x, 5). Other than using a bunch of if statements, is there a way to make x = 5?

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Azzi Abdelmalek 2014-8-8

This is not clear, variable and value are not used in your function

Andrew 2014-8-8

That's the thing, I don't know how to use them. 'variable' should match one of the ones declared in the code (i.e. x, y, or q) and 'value' is whatever value that variable should be. So if my input is (y, 10), then I want to set y = 10.

I'm explaining this poorly, I apologize, but I'm not quite sure how else to describe it.

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Answer 1

A Jenkins 2014-8-8

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Some of it depends on how much you want to protect against "bad" values or variable names being passed. But here is a simple trick:

function [output] = test(variable, value)
  mydata.x = 2;
  mydata.y = 3;
  mydata.q = 10;
  mydata.(variable)=value
end

........................................................

>> test('x',5)
mydata = 
    x: 5
    y: 3
    q: 10

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Andrew 2014-8-8

Yeah, that should work, thanks!

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Answer 2

Geoff Hayes 2014-8-8

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在 MATLAB Online 中打开

Could also just compare the input variable to a set of pre-defined "matches"

 function [output] = test(variable, value)
x = 2;
y = 3;
q = 10;
if ischar(variable) && isvector(variable)
    if strcmp(variable,'x')
        x = value;
    elseif strcmp(variable,'y')
        y = value;
    elseif strcmp(variable,'q')
        q = value;
    end
end