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I don't know what kind of algorithm it runs in the background but it seems that it cannot handle matrices which contain elements on the order of 10^-5.
It can handle upto 16 digits. Type:
format long;
a = 1.234567890123456;
in your MATLAB code or command window.
4 decimal places is the limit of format short.
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I am confused about a situation which is presented on the following slide:
Last sentences says that:
It is important to note that deterministic does not mean that
xt is non-random. What does this mean? If A and B are random variable, then x must be random right?
I think the point may be that nature may choose randomly among different paths, but once you know which path has been chosen you can predict future values of x_t on the path from past values x_{t-1}, etc. So e.g. nature may flip a coin to choose between the following two paths: x_t=0 for all t, and x_t=1 for all t. Then if you don't know the path, x_t is indeed random. But once you know x_{t-1}, you know x_t.
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How should I solve my equations in Perl?
I know binary search is one solution (and perhaps pretty fast for my equations) but I would like to know if there is a ready to use solutions such as math packages or libraries so that I can use them instead of implementing my own solver?
NOTE:
This is, find x for a given y.
The functions are strictly increasing
The equations usually look like: y = a + b*sqrt(x) + b*x or y = sqrt(a*(x-b)**2*(x-c)/(x-d))
Please don't complain that "this is off topic" or "you should ask this in http://math.stackexchange.com". I want to see this problem from the programming point of view, particularly in Perl!
Have you considered using libraries? There's Math::LP, for instance.
See the Perl and Math tutorial from PerlMonks for more info.
Search for symbolic math on MetaCPAN. Lots of interesting looking options.
https://metacpan.org/search?q=symbolic+math
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I have a float number that I would like to display in a string way.
E.g.
0.33 should be displayed as 1/3
0.5 should be displayed as 1/2
How can I do it in objective-c with no switch? (as I could have 3/4, 2/5 etc)
There's no objective-c way to do this, you'll have to implemente it yourself and find an algorightm.
What about trying combinations of A/B where A,B from 0 to 10, until you reach the number?
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How do I read a 5-D data structure (of type double) in matlab? I have loaded the data in matlab and it says 5-D double. How do I read it afterwards
With the current information I cannot say much, but usually this is a good first try:
In matlab navigate to the file, right click on it and choose import data.
The import wizard is quite powerful so you have a good chance to get the data you need from that. Afterwards you may need to try help reshape if it does not have the right dimensions yet.
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So, I'm attempting to access an array of length 165888. I'm looping through, calculating my index as I go. At one point, I get to 110689, and this, for some reason, throws the following error:
Attempted to access buf(110689); index must be a positive integer or logical.
Any ideas?
It was a rounding thing. I was doing a calculation, and forgetting to round.