f



What is the difference between (x^2+y^2) and (x.^2+y.^2) in matlab?

z=sqrt(x^2+y^2) 
c=(z<15) 
imshow(c) 
gives a square cut diagonally half with lower right side being white and other being black

z=sqrt(x.^2+y.^2) 
c=(z<15) 
imshow(c) 
gives a square with circle in centre

What is the difference between (x^2+y^2) and (x.^2+y.^2) in matlab?
0
Sagar
1/29/2016 1:33:04 AM
comp.soft-sys.matlab 211266 articles. 24 followers. lunamoonmoon (257) is leader. Post Follow

1 Replies
1607 Views

Similar Articles

[PageSpeed] 44

"Sagar Chand" <sagarchand_9@rediffmail.com> wrote in message <n8efgg$100$1@newscl01ah.mathworks.com>...
> z=sqrt(x^2+y^2) 
> c=(z<15) 
> imshow(c) 
> gives a square cut diagonally half with lower right side being white and other being black
> 
> z=sqrt(x.^2+y.^2) 
> c=(z<15) 
> imshow(c) 
> gives a square with circle in centre
> 
> What is the difference between (x^2+y^2) and (x.^2+y.^2) in matlab?

The ^ operator (without the period) is matrix power.  The .^ operator (with the period) is element-by-element power.  Hence you will get different results if x or y are not scalar.

James Tursa
0
James
1/29/2016 2:12:03 AM
Reply:

Similar Artilces:

how to convert union(2*x+y=3,3*x+2*y=5) to {2*x+y=3,3*x+2*y=5}
Thanks! In article <1140494713.980133.168190@f14g2000cwb.googlegroups.com>, loric <dr.huiliu@gmail.com> wrote: >Thanks! It isn't clear exactly what your question is, but: > `union`({2*x+y=3},{3*x+2*y=5}); {2 x + y = 3, 3 x + 2 y = 5} > Union := proc() { seq( `if`(s::'set',op(s),s), s=args ) } end proc: > Union(2*x+y=3,3*x+2*y=5); {2 x + y = 3, 3 x + 2 y = 5} > Union(2*x+y=3,{3*x+2*y=5}); {2 x + y = 3, 3 x + 2 y = 5} ...

suppose I have an equation x^2+x+y^2+3*y=5*y^2+3*y+3*x*y+5 and I want to find the set of (x,y) that satisfy the equation.
Question How can i do that? I've been trying, solve, explot and subs. I can get the graph, but i cannot get the (x,y) pairs that I want. When I use function solve to solve the equation in term of x or y and then substitute the numeric value for one of them to find the other, I got the problem about complex numer. This might be because that numeric value that I substitute is not the number that satisfy the equation, so the program give me the result in complex number. Background. I need to use the pairs to find the optimal value of my objective function. I tried to use the fminco...

URGENT:How to graph f(x,y)= 2-x-(y-2)^2
Hi Fellas: What happens is that I need to put the value for Indep:X or Indep:Y ? I have tried both of them and I am receiving an error message. I can plot it just using X or Y as Indep value, also the graph is not pointing at the righ side. This is a parabola but both sides of the parabola are pointing to -y, It should be to -x. I think Indep values must be xand y at the same time but the calculator does not allow me to put x and y together, why? Help please... Thanks everybody for your time. Jp In plot setup, chose tye: CONIC This should solve your problem Arnaud Arnaud wrote: > In...

plot f(x,y)=x^2+x*y+y^2
hi, is there a way to plot this funtion?: f(x,y)=x^2+x*y+y^2 (just like a polynomial for instance) In article <fp55a4$6lo$1@fred.mathworks.com>, Rafa <l_black_flowers_l@hotmail.com> wrote: >is there a way to plot this funtion?: f(x,y)=x^2+x*y+y^2 >(just like a polynomial for instance) xr = -5:.1:5; yr = -3:.2:8; [x, y] = ndgrid(xr, yr); f = x.^2 + x.*y + y.^2; surf(xr, yr, f); -- "Let me live in my house by the side of the road -- It's here the race of men go by. They are good, they are bad, they are weak, they are strong Wise, foolish -- so am I;&q...

How to simplify ArcCos[x/Sqrt[x^2+y^2]] to Pi/2-ArcTan[x/Abs[y]]?
Hi, ArcCos[x/Sqrt[x^2+y^2]] and Pi/2-ArcTan[x/Abs[y]] are the same. But I can not get the first expression be simplified to the second one. And the following command can not be simplified to zero in mathematica as well. FullSimplify[ArcCos[x/Sqrt[x^2 + y^2]] - ( Pi/2 - ArcTan[x/Abs[y]]), Element[x, Reals] && Element[y, Reals]] I'm wondering if there is any walkaround to do this simplification. Thanks, Peng Peng Yu schrieb: > Hi, > > ArcCos[x/Sqrt[x^2+y^2]] > > and > > Pi/2-ArcTan[x/Abs[y]] > > are the same. &...

want a g(x,y)=A+B*x+C*y+D*x^2+E*y^2+F*x*y fit for trend removal
I have a 2D video stack of images (8 bit greyscale) and would like to take out vertical and horizontal trends. I can easily take the average of the stack to get one image, but is there an easy way of finding this 2D array's best fit into an equation of the form g(x,y)=A+B*x+C*y+D*x^2+E*y^2+F*x*y ? I know there is a program called polyfit that is on the right track for what I want to do, but it is not exactly what I want for this data analysis. Is there something better out there for what I am wanting to do? Thanks, Stephen Stephen wrote: > I have a 2D video stack of images (8 bit...

How to plot (x^2+y^2-1)^3
Does anybody knows how to plot (x^2+y^2-1)^3 - x^2*y^3 =0 in gunplot? Thanks in advance On 27.10.2012 18:51, Shin wrote: > Does anybody knows how to plot (x^2+y^2-1)^3 - x^2*y^3 =0 in gunplot? gnuplot generally only does explicit or parametric curves, not implicit ones like the above. But you can fake it to some extent by asking for z=0 contour of the surface z = f(x,y)=(x^2+y^2-1)^3 - x^2*y^3: gnuplot> f(x,y) = (x**2+y**2-1)**3 - x**2*y**3 gnuplot> set contour base gnuplot> set cntrparam lev discrete 0 gnuplot> set isosamp 50 gnuplot> set view map; uns...

x^(3/2)+x^(5/2) = (x+x^2)*x^(1/2)
Is there a simple way to get Maple to convert x^(3/2) + x^(5/2) to (x+x^2)*x^(1/2). I am willing to assume(x>0). Maple does recognize these as being equal: > p:=x^(3/2)+x^(5/2): > q:=(x+x^2)*sqrt(x): > simplify(p-q); 0 Here's a clumsy way to do it: > p:=x^(3/2)+x^(5/2): > assume(t>0): > subs(x=t^2,p); > simplify(%,{t^2=x}); > collect(%,t); Is there something simpler? (This has undoubtedly come up before, but I cannot find it anywhere.) --Edwin If you do not insist upon your incomplete factoriz...

Transfer solution from N(e,r) to N(r,x,y,z) where r=sqrt(x^2+y^2+z^2)
Hallo, I have solved an equation and got solution N(e,r)or number of particles(N) as a function of energy(e) and position(r). I want to transfer this solution to N(e,x,y,z) where r=sqrt(x^2+y^2+z^2). How do I do it? On 29 Mrz., 09:45, "Sunipa Som" <sunipa_...@yahoo.com> wrote: > Hallo, I have solved an equation and got solution N(e,r)or number of particles(N) as a function of energy(e) and position(r). I want to transfer this solution to N(e,x,y,z) where r=sqrt(x^2+y^2+z^2). How do I do it? It's not clear to me what you are trying to do. N(e,x,y,z) is your solution, ev...

how to "(1-3*x^2)/(1-3*x+x^2+2*x^3) => 1/(1-2*x) + x/(1-x-x^2)"?
hi normal(1/(1-2*x) + x/ (1-x-x^2),expanded); 1/(1-2*x) + x/(1-x-x^2) => (1-3*x^2)/(1-3*x+x^2+2*x^3) how to do the reverse? dillogimp@gmail.com writes: > normal(1/(1-2*x) + x/ (1-x-x^2),expanded); > 1/(1-2*x) + x/(1-x-x^2) => (1-3*x^2)/(1-3*x+x^2+2*x^3) > how to do the reverse? convert(%,parfrac,x); -- Joe Riel ...

x^2-x-x^3 -> -(x^3-x^2+x) #2
The CAS "simplifies" x^2-x-x^3 to -(x^3-x^2+x) (flag -114 clear). Is there a way to set it to simplify this to -x^3+x^2-x ? John Pressman wrote: > The CAS "simplifies" x^2-x-x^3 to -(x^3-x^2+x) (flag -114 clear). Is > there a way to set it to simplify this to -x^3+x^2-x ? FDISTRIB Regards, -- Beto Reply: Erase between the dot (inclusive) and the @. Responder: Borra la frase obvia y el punto previo. ...

Assume X; Y and Z are jointly Gaussian mean-zero random variables with the (joint) variance given by K := Var(X; Y;Z) =[2 1 0;1 2 1;0 1 2 ]
Assume X; Y and Z are jointly Gaussian mean-zero random variables with the (joint) variance given by K := Var(X; Y;Z) =[2 1 0;1 2 1;0 1 2 ] (a) Determine the distribution of U = X + Y + Z. (b)Let W = X + Y and V = X + Y . Compute the joint distribution of W and V . after assiging the values to k matrix how can i find u "pramod kumar" <pramod.kilu@gmail.com> wrote in message news:jpbdev$hqh$1@newscl01ah.mathworks.com... > Assume X; Y and Z are jointly Gaussian mean-zero random variables with the > (joint) variance given > by > K := Var(X; Y;Z) =[2 1 0;1...

porting network driver from 2.2.x to 2.4.x #2
Hello, All! There are some sources of pseudo network interface driver develkoped for 2.2.x kernel. I have to port it onto 2.4.x kernel. I have explored the structure 'net_device' from linux/net/netdevice.h, there are few major changes. The main problem for now is - how to check that interface is ready to transmit data (in 2.2.x 'tbusy' field was used fot this and function 'test_and_set_busy' checking the 'tbusy' state). But thus field was removed from 2.4.x kernel, and now you should use the function 'netif_start_queue' or 'netif_stop_queu...

Signed square ss(x) = (x^2)^(1/2)*x = sgn(x)*x^2
Hi Since the power is more relevant to analyze than the amplitude I have come = up with the idea of using signed square ss(x) =3D x^2 for positive x and -x= ^2 for negative x or ss(x) =3D (x^2)^(1/2)*x =3D sgn(x)*x^2 Instead of analyzing the power as the square of the amplitude the signed po= wer could be used instead. This would preserve more information of the orig= inal signal. The original amplitude signal can be recreated from the signed= square power signal with signed square root. I can imagine signed square to be applicable to codec evaluation and signal= compression s...

Web resources about - What is the difference between (x^2+y^2) and (x.^2+y.^2) in matlab? - comp.soft-sys.matlab

Difference - Wikipedia, the free encyclopedia
Text is available under the Creative Commons Attribution-ShareAlike License ;additional terms may apply. By using this site, you agree to the ...

3Q EARNINGS: Mark Zuckerberg on the Differences Between Messenger and WhatsApp
When Facebook announced its intent to acquire cross-platform messaging application WhatsApp in February, questions surfaced on whether WhatsApp ...

Facebook Tips: What’s the Difference between Top News and Most Recent?
The following is part of our series, Facebook Tips, which answers some of the most commonly asked questions about using Facebook. While we hope ...

Sole difference in tourism stakes
A GIANT blue stiletto heel dubbed Taiwan’s “shoe church” is bringing a touch of oversized glamour to the island’s southern coast.

Women and weed: the gender differences in cannabis use and abuse
For a growing number of women, smoking dope every day is becoming a worrying habit.

iOS App Store brings in 75% more revenue than Play Store despite difference in downloads
... app store. The iOS App Store now earns 75 percent more revenue than the Google Play Store. This is an increase over the 70 percent difference ...

Sprint cuts customer service jobs, says customers won’t notice a difference
Sprint is reportedly cutting 2,500 jobs, including 2,000 in customer service, but the company told Ars that subscribers won't actually see any ...

Is There Much Difference, Policy-Wise, Between Cruz, Rubio, Herr Trumpf And Ryan?
... Cruz or Rubio gets into the White House, we are in deep, deep trouble. Time to redouble our efforts for the one candidate who can make a difference ...

Sex Assault, Rapes At European Swimming Baths Blamed On 'Cultural Differences'
Public pools in Sweden and Germany are tightening security after a spate of sexual assaults and suspected rapes by migrant bathers on European ...

It’s Mardi Gras: Celebrate Both Creole & Cajun But Know The Difference
... was in a Sazerac cocktail and how tabasco peppers were harvested. Above all, the most enlightening topic for me was to learn the real differences ...

Resources last updated: 1/29/2016 8:06:56 AM