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hi electricpete A quick paste into matlab of your code with the index resulted in the following error. ??? The following error occurred converting from sym to double: Error using ==> sym.double at 25 DOUBLE cannot convert the input expression into a double array. If the input expression...

Hi all, How can I create a matrix of symbolic objects like A=[a1,a2,a3,a4.........a60] using possibly an index such as i=1:60 if possible . Again is it possible to mix symbolic objects and numeric decimals in one matrix, such as A=[a1,a2,a3,4,5,6,a4....] cheers musilj

hi electricpete thanks for the reply, I understand that i have to come up with a rectangular mesh as you rightly point out, my real issue is in the Matab implementation- maybe i am just not thinking hard enough! I have solved the problem before by hand calcs taking a few nodes and set up a...

hi all, I need to work out the the voltage distribution in the dielectric material and TEM transmission line parameters. The cross section has 0 V at the boundary AND unbalanced conductors at 10 V as illustrated on attachment. I need to write a matlab code that automatically sets up a matrix...

settled on block oriented matlab fft - ofcourse you are right thresholding is about amplitude. maybe i failed to put it across clearly, my problem was on knowing/detecting where the silence periods were. nways thats not necessary when i process the wave file in frame by frame.obviously it does...

hi IRstuff I tried to implement thresholding, but the problem is the time magnitude of the dtmf will not be necessarily at zero or near zero when the next number is pressed. in other words the preceding time domain value of the dtmf could be any value, although of course steady (not oscillatory)...

hi IRstuff, Self-schooling DSP, and have been checking on time and frequency domain analysis techniques like thresholding,segmentation and the like but all seem to apply a fixed tone length and sample length- which can work well sometimes- i have been hitting hard on how i can automatically...

Hey all, I am trying to decode a dtmf signal which according to the time plots in Matlab comprises of 5 digits. My problem is that i can't seem to find a way of detecting the start and end of the individual tones in the wavefile. I don't intend to use a fixed tone length, as this is not...

Thanks it worked ok

I am stuck on a seemingly easy one, how can I quote/state the error in a product of numbers for example(x1,x2,x3) with errors +/- 0.5, +/- 0.4, +/- 0.35

Yep i intended to use CAD as a check for the manual calculations. thanks all, i got a good estimate.

I have been trying to interpret your reply, but probably not smart enough, I don't understand whether I will need to calculate the sides of the triangles? Do you mean joining three points (3 sets Eastings, Northings, and RL) as given in the data to form the triangle vertices? I tried some form...

YES, those are ALL the points representing boundary points, and YES there are only 3 interior points.

I have the coordinates as shown, i have calculated the total area which i realise might be the plan area. I need to calculate the volume of the pile. Northing Easting RL (metres) 1838.9 2222.3 191.8 1849.2 2221 192 1858.3 2222.3 191.8 1865.6 2231.5 190.6 1862 2239.8 189.9 1857.5...

I haven't got the patch sizes. all I have calculated is the area covered by the poly coordinates, which to me appears like the plan/base area(from top), without taking into consideration the slope. the shape formed looks like a frustum but not exactly. Simpson's might work but is there any other...

Is there a method to calculate volume of an irregular poly formed by crushed ore stockpile. I plotted the rough poly with excel, I intend to do it manually and checking accuracy with a software program. i have calculated the area under the coordinates. how do i calculate the volume? i have the...