How do I calculate equation sets of 3 unknown x,y,z given csv. file with 30 different sets of equations?

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Erling A Bentzen 2016-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/306037-how-do-i-calculate-equation-sets-of-3-unknown-x-y-z-given-csv-file-with-30-different-sets-of-equat

关闭： MATLAB Answer Bot 2021-8-20

Hi I'm fairly new to Matlab and I'm having issues figuring out how to solve this problem: Given a csv. file with 90 rows of values (ex. -38,-16,40,-19), each representing a part of an equation set of 3 (that means 3x30 sets of equations). I'm asked to return the equations in the first output of the function, and the following answer in the second output. Is there a fast, neat way to solve this? Please help

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John D'Errico 2016-10-6

Just use a loop. Fast. Efficient. Simple to write. There is no reason to need to make this vectorized. Sometimes people want to see a nice expression that magically does what you want. But too often that one line expression is impossible to read. It works, but why bother here?

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Answer 1

Hoai Tran Quoc 2016-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/306037-how-do-i-calculate-equation-sets-of-3-unknown-x-y-z-given-csv-file-with-30-different-sets-of-equat#answer_237894

在 MATLAB Online 中打开

testEQdata.csv

Hope it helps you.

a = csvread('testEQdata.csv');
X = zeros(90,1);
for i = 1:30
    A = a((i-1)*3+1:(i-1)*3+3,1:3);
    B = a((i-1)*3+1:(i-1)*3+3,4);
    X((i-1)*3+1:(i-1)*3+3,1) = linsolve(A,B);
end
disp(X);