MATLAB: Where to put the period in this expression

arrayerrorfunctionmtimesperiodvector

RV = (w*r*c)/sqrt((1-w^2*l*c)^2+(w*r*c)^2)

w is the vector I need to pass through the expression

I've tried about 5 different combinations and keep getting the mtimes error.

Thanks for the help.

Also, is there a rule of thumb for the placement of the period(s) in an expression such as this?

Best Answer

If you want an element by element operation, use a period. If you want a matrix style operation, just use the operator (*,/,^) without the period. I trust you know the difference between element-by-element and matrix operations. To answer your question we'd need to know which variables are scalars and which are matrices. I'd guess that you want periods in front of all of them, but that's my guess.

RV = (w.*.r.*c)./sqrt((1-w.^2.*l.*c).^2+(w.*r.*c).^2)

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MATLAB: Trouble by function handling: “Inner matrix dimensions must agree.”

You get that message when you try to use "*" to multiply two matrices and the second dimension of the first matrix does not match the first dimension of the second matrix. That is, "*" means "matrix multiplication".

Probably somewhere in your expression is a vector. You might be thinking you are squaring each element of the vector by multiply the vector by itself, but since "*" is matrix multiplication instead you get an error.

Convert your "*" in to ".*" and convert your "/" in to "./" except for the cases where you are sure that you want matrix multiplication (in the mathematical sense.)

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*  % matrix multiply
.* %scalar multiply
/  % matrix divide
./ % scalar divide
^  % exponentiation
.^ % element-by-element exponentiation

so for your equation:

1./sqrt((R.^2+(w.*L-1/(w.*c)).^2));

Best Answer

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