Is there way to easily change the value of multiple values using a for loop?

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Nick
Nick 2021-11-14
回答： Sahil Jain 2021-11-17
This is hard for me to explain, but I was wondering if there was a way to use a for loop to simlify this code. My problem is that I dont know how I could call the specific variable in the for loop that is needed to be changed.
My Code:
if isempty(k1_exact)
k1_exact = -1;
end
if isempty(k2_exact)
k2_exact = -2;
end
if isempty(k1_U)
k1_U = -3;
end
if isempty(k1_L)
k1_L = -4;
end
if isempty(k2_U)
k2_U = -5;
end
if isempty(k2_L)
k2_L = -6;
end

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回答（1 个）

Sahil Jain
Sahil Jain 2021-11-17
Ran in:
Hi Nick. You can try using the "eval" function for your purpose. The following code snippet demonstrates how you may go about it.
variables = ["k1_exact", "k2_exact", "k1_U", "k1_L", "k2_U", "k2_L"];
for i=1:length(variables)
eval(strcat(variables(i), "=-", num2str(i)))
end
k1_exact = -1
k2_exact = -2
k1_U = -3
k1_L = -4
k2_U = -5
k2_L = -6
For every variable, we first create a string of the assignment expression. We then pass this string to the "eval" function to execute the operation.

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