How to assign a value to a variable in for loop?
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Hello all,
I'm getting some input from the user to create the name of a variable as follow:
LocationIMU = string(input('thigh/shank/foot?','s')); %'thigh'
Side = string(input('paretic/non?','s')); %'paretic'
Component = string(input('X/Y/Z/Ox/Oy/Oz?','s')); %'X'
File = string(input('acceleration or angular velocity?','s')); %'acceleration
assignin('base',strcat(LocationIMU,'_' ,File ,'_' ,Component ,'_' ,Side, '_Good'),zeros(101,1));
up to here I get what I want, a variable named thigh_acceleration_X_paretic_Good ( considering the comments as input).
Now I need to creat a for loop and in this for loop I'll be adding new columns to this variable but as this variable can change accordingto input, I don't want to hard code it and need to find a way to add the columns to it. Here's what I am trying to do but as said I don't want it to be hard coded:
for i =1:endLoop
signal = 1:100;
thigh_acceleration_X_paretic_Good (:,end+1) = signal;
end
here I hard coded the variable name, how could I do it without writing the variable name and instead having it from inputs?
I hope I could explain what I mean.
1 个评论
Stephen23
2022-10-14
"I hope I could explain what I mean."
We understand what you mean, and we also know that the answer is always the same: do NOT do this.
Meta-data (e.g. location, component, side names) is data, and data belongs in variables (not in variable names). Once you store meta-data in variables, then your code will be neat, simple, and efficient (unlike with what you are trying to do).
采纳的回答
Jan
2022-10-14
This is the most frequently asked question from beginners. Professional programmers give the simple and not expected answer: Don't do this! You drill a hole in your own knee.
This is exhaustively explained here: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
Do not store important information in the name of variables, but in their values.
3 个评论
Walter Roberson
2022-10-14
Who imposed the external requirement that you create dynamic variable names?
Jan
2022-10-15
@azarang asadi: As said already, this is the question asked most frequently by beginners. Others and me have dicussed this exhaustively hundreds of times. The results was always the same: You are the programmer and you can write cleaner and better and most of all working code.
Take the chance to learn from the mistakes of others.
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