how do I right x^2 in MATLAB
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i trying to do some equetion and i come up with an erro message every time i right it out
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John D'Errico
2020-11-23
编辑:John D'Errico
2020-11-23
Is x a scalar? If so, then you write it as x^2.
Is x a vector? Then, assuming you want to perform an element-wise squaring, you use x.^2.
If you are asking this question, you REALLY need to be reading the getting started tutorials - the Onramp tutorials are a good place to start. There are also multiple MATLAB tutoring sessions on Youtube to watch.
Finally, when you get an error. then show what you did. Show the COMPLETE error message, thus everything in red. Otherwise we need to make wild guesses as to what you did wrong.
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Steven Lord
2020-11-24
John and Rik both suggested that you work through the MATLAB Onramp tutorial and I agree with that suggestion. It is about a two hour long free course with videos and hands-on exercises that are automatically scored (so you get feedback about whether your answer is correct right away) and is designed to teach you the basics of working with MATLAB. I suspect after taking sections 4 and 6 you will understand the difference between the ^ and .^ operators and be able to answer your question.
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Steven Lord
2020-11-23
To raise a square matrix to a power use the ^ operator.
To raise each element of an array (the array need not be square or even 2-dimensional) to a power use the .^ operator.
A = [1 2; 3 4]
S1 = A^2
S2 = A.^2
If your matrix is not square (for example, if it is a row vector) then .^ will work but ^ will not.
thisWillWork = (1:5).^2
thisWillNOTWork = (1:5)^2
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Image Analyst
2020-11-24
Alex, why won't you ask questions here so all of can benefit from the discussion (like Steven specifically said)? Most volunteers here don't like offering free, private consulting via email when the Mathworks went to all this trouble to set up this nice forum for everyone's benefit. Besides, other people are helpful too. We volunteers range anywhere from people who simply give you the answer outright, to those like John who try to guide you to the answer so that you learn it more deeply than just being handed an answer. Even though John and Steve's approach may not be the fastest today, if you learn MATLAB, you will be faster in the future and won't have to ask. Indeed, hopefully you'll be the expert one day and be helping others here.
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