This is really not the right venue for your question. Please contact technical support.

–Loren

i have created a gui with an axes called offline. in this axes i load an image called IMG. if i want to use the impoly, imfreehand, imellipse or imrect it doesn’t work:

axes(handles.Offline)
imshow(IMG);
s = imrect(gca,[]);

give no result.

but with

axes(handles.Offline)
figure, imshow(IMG);
s = imrect(gca,[]);

i can do it. without figure it works only if i give the points:
…
s = imrect(gca,[10 10 100 100])

what can i do?

regards torsten

Matrix multiplication is supported with multithreading, but the specific behavior you see depends on what BLAS are running behind the scenes. I suggest you contact technical support to work with you on this.

–Loren

However, we need to speed up multiplying a matrix by a vector,
x=rand(1000,1000); y=rand(1000,1); z=x*y;

This always runs on one core when one imagines that it would be possible to run it on all 8 by slicing x horizontally into 8 smaller matrices, e.g.
x1=x(1:125,:), z1=x1*y, etc.

Please can you suggest what we should do?

R2007b, function fastinsert, line 104
e = fetch(e, 0);
takes 82 % of calculation time of fastinsert

R2007a, function fastinsert, line 104
e = fetch(e, 1);
takes 34 % of calculation time of fastinsert.

Obviously the change

from
e = fetch(e, 1);

to
e = fetch(e, 0);

does not improve fastinsert. I’ve sent an e-mail to support this morning.

–Loren

1. I tried to run MCRInstaller.exe on a machine with Windows XP and a dual core processor, but the program didn’t work on this machine. On other machines (where Matlab is installed) it did work.

2. When I try to run the profiler on my laptop (which has a dual core processor, 1 GB RAM and Windows XP), Matlab hangs up. I have trouble terminating Matlab even from task manager, leave alone closing the application I am trying to test.

I can’t renounce on multithreading so I must profile my application on my laptop. The compiled program must be able to run on the machine MCRInstaller didn’t work on.

I downloaded R2007b from http://www.mathworks.com and today I received R2007b on DVD. Are the problems I am experiencing caused by dual core processors and multithreading or is it caused by downloading?

Someone please help me.

The Image Acquisition Toolbox does not support non-Windows operating systems because most of the hardware that the toolbox supports does not have drivers on those systems. We are monitoring the situation and the number of requests that we get for such support. The Image Acquisition Toolbox does support Vista, but most of the supported hardware does not have Vista compatible drivers.

the new mmreader’s capability to read files other than .avi looks good. ideally though, there would be a complementary mmwriter. why wasn’t there an mmwriter object shipped with 2007b, considering that for winxp 64, you can’t compress .avi files?

also, the photoshop/matlab x64 integration could use some work, but i suppose i should complain on an adobe blog about that =)