help me with dots location

I have no idea how to add dots to this equations. ab is matrix, er1 and er2 are variables. Please help me :3 CODE:

ab=(0.01:0.01:10);
er1=2.05;
er2=4;
Z01=60*log(ab)*sqrt((log(0.5*ab)+log(0.5))/log(ab));
Z02=60*log(ab)*sqrt((er1*log(0.5*ab)+log(0.5))/(er1*log(ab)));
Z03=60*log(ab)*sqrt((er2*log(0.5*ab)+log(0.5))/(er2*log(ab)));

Answer 1

[Star Strider]

I assume you intend ‘add dots’ to create element-wise operators:

ab=(0.01:0.01:10);
er1=2.05;
er2=4;
Z01=60*log(ab).*sqrt((log(0.5*ab)+log(0.5))./log(ab));
Z02=60*log(ab).*sqrt((er1*log(0.5*ab)+log(0.5))./(er1*log(ab)));
Z03=60*log(ab).*sqrt((er2*log(0.5*ab)+log(0.5))./(er2*log(ab)));

Here I substituted ‘.*’ for ‘*’ and ‘./’ for ‘/’, that I assume is what you want to do. See the documentation for Array vs. Matrix Operations for details.

Answer 2

[dpb]

Everywhere there's an arithmetic operator (other than + or - which are born doing the right thing :) ) replace the operator with it's "dot" doppelganger twin -- '*' --> '.*', etc. when you want/expect operations on an element-by-element basis. Otherwise for vectors or matrices, those operations have equivalent meanings as matrix multiply, etc.

It's not the simplest thing to find in the doc's; the search engine fails for ".*" as a string; you needs must know that the name is [m]times for the functions, not "mult" or some variation thereof. The best discussion is from the Language Fundamentals/Operators and Elementary Operations/Operators.

Answer 3

[Arcadius Unknown]

Thanks for all the replies, it worked :)

[dpb]

So "ACCEPT" an answer....

[Image Analyst]

And you can also vote for one or both. It's the polite thing to do to give the people who took the time to help you "credit" for their efforts.