Matlab

Fitting a surface
I want to fit a surface to my data. It is temperature (Z), given two factors: depth (X) and hour of the day (Y). I've already made simulated data using SIN function (relating temperature to hour of the day) and EXP function (relating temperature to depth), and adding some random error. How can I fit a surface to ... 14 May 2010 21:35

Parallel port access without Data Acquisition Toolkit
Is there any way to access the parallel port pins without the Data Acquisition Toolkit. I am on a 64-bit machine, and there is no 64-bit version of this toolkit. Thanks ... 14 May 2010 19:24

Complete and utter noob in Matlab
Hi. I'm currently taking a summer class which requires Matlab and is going at the speed of light, unfortunately. Now I have no experience with Matlab whatsoever. I'm not sure on where even to begin. My questions are dumb, I know, and I'm growing desperate fast. I'm looking at an example that the professor gave u... 17 May 2010 11:18

Returning a specified iteration from iterative solvers such as bicgstab
Is there a way to return a specific iteration from an iterative solver such as bicgstab? I would like to see what the estimate looks like at iterations other than the one iteration returned with the lowest relative residual. ... 14 May 2010 18:19

vectorizing cell arrays; making cell arrays faster; for loops
I understand that typically "vectorizing" and removing for-loops makes Matlab code (within Matlab, I'm not talking about compiling/hand-converting to C, C++, etc.) faster inside the Matlab application. However, I have successfully "vectorized" some code involving "cell arrays" and it appears not to be significantly... 15 May 2010 10:25

How do you make an unavailabe COM port available?
I am trying to connect some wires to a COM port or PS/2 port to transmit data to a relay and stimulus. When I try to access some of the COM ports through MatLab an error is returned that says the COM port is unavailable. This is because there is not an actual RS232 wire attached to the port but simply some copper wir... 14 May 2010 17:13

Slow graphics refresh
I have a reasonably powerful computer but since I updated to R2010a it seems like Matlab takes a long time to refresh graphics. For example, if I would like to insert a text label with the gtext command or use the plot editing tools, they take about 10 seconds to open up. I am not sure where to start with diagnos... 14 May 2010 17:13

(1) color order in plot' (2) colormap with 2 axes in gui
Hello! Two questions for everyone to consider... (1) I'm working on a gui with an image being shown next to a plot. The user selects regions of an image using roipolyold, and with each new region, a line is added to the plot next door. I've got the color of each additional line on the plot changing with no problems,... 4 Jun 2010 13:39

image processing
Hi I have 2 gray scale images, i want to take the MSB of first image and MSB of second image then combine them to create new image then extract the 2 image from the resulted image Image a, image b A_msb + b_msb = C extract the two image from C Thank you ... 14 May 2010 17:13

semilog plots with pcolor?
I am trying to plot data with pcolor that is linear in the Y axis but normally distributed to the log of the X axis. To visualize this, I would like to use pcolor, and to have the values on the X axis increase exponentially, but be evenly spaced along the axis. Any suggestions? I'm at a loss. -chris ... 14 May 2010 17:13