Add a dynamic amount of symbolic variables into a script

Question

Connor LeClaire 2021-10-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1568398-add-a-dynamic-amount-of-symbolic-variables-into-a-script

回答： Paul 2021-10-21

I am attempting to add a number of symbolic variables dynamically for a script.

The script will get an input from the user about how many joints they are inputting in for some robotic manipulation calculations. Based on this I would like to insert a number of symbolic variables (equal to the amount specified at the initial input).

Is there a way to do this that isn't creating a bunch of variables in storage like:

syms v1 v2 v3 v4 v5 v6 v7 v8 v9 v9 %...
variables = [v1 v2 v3 v4 v5 v6 v7 v8 v9] %...
numvars = input('How many joints would you like to enter: ');
for i=1:numvars
    %Do something
end

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Answer 1

Paul 2021-10-21

1
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https://ww2.mathworks.cn/matlabcentral/answers/1568398-add-a-dynamic-amount-of-symbolic-variables-into-a-script#answer_813168

在 MATLAB Online 中打开

numvars = 5; % for example

V = sym('V',[1 numvars])

V =

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Answer 2

Connor LeClaire 2021-10-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1568398-add-a-dynamic-amount-of-symbolic-variables-into-a-script#answer_813153

在 MATLAB Online 中打开

After further research and help from a friend, here is the answer:

numVars = input('Enter how many joints: ');
variables = sym(zeros(1,numVars));
for i=1:numVars
    variables(i) = sym("V"+ num2str(i));
end
disp(variables);