What code would you input to represent the equation for the volume of a sphere without getting an undefined variable error?

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Ethan Sehrt
Ethan Sehrt 2016-6-19
回答： Tarence Glasker 2017-9-22
V=(4*pi*r^3)/3

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John D'Errico
John D'Errico 2016-6-19
编辑：John D'Errico 2016-6-19
Easy, peasy.
V=(4*pi*r.^3)/3;
I added a semi-colon at the end, and I used .^ for the exponent, in case r is an array or vector.
Since you apparently are getting an undefined variable error, then you need to tell us more.
My guess is, you actually want to create a function of the radius, so that r is indeed undefined at the time you create the function.
V= @(r ) (4*pi*r.^3)/3;
Or possibly, you want to create this in symbolic form. In that case, you need to define r as symbolic.
help syms
How can we know what is in your mind?
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Ethan Sehrt
Ethan Sehrt 2016-6-19
yeah I don't have the symbolic toolbox and whenever I type help syms, it corrects it to help sum. I suppose this is a result of not having the symbolic toolbox. So I guess volume as a function of the radius is the next best approach.
John D'Errico
John D'Errico 2016-6-19
Yes, you must not have that TB. Within limits, you COULD use my sympoly toolbox. It is on the File Exchange. It is admittedly limited though.

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Tarence Glasker
Tarence Glasker 2017-9-22
tan(x/2) = sort(1-cos(x) / 1+cos(x) how to input matlab
Tarence Glasker
Tarence Glasker 2017-9-22
how to input equation into matlab function tan(x/2) = sort(1-cos(x) / 1+cos(x);?

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