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Re: 3.1 Prime Spellcheck
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Spline fit
I'm familiar with using the spline and interp functions in Mathcad to use spline-interpolation of a dataset. Considering a situation where the dataset is noisy, I'd like to be able to fit a spline of n-degrees of freedom rather than creating a spline that goes through all datapoints. I can't find any help in the Mathcad documentation so input from you guys would be much appreciated.
I can see it exists for Matlab: File Exchange - MATLAB Central
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Re: Spline fit
In Mathcad 15, go to "Help", "E-books", "Data Analysis Extension Pack", Under "Non-parametric fitting / Interpolation", choose "B-Splines and Least-Squares Splines". If you are using Prime I'll have to figure out where the information is.
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Re: Spline fit
I'm afraid no E-books are available for me, can it be attached here?
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Re: Spline fit
Which version of Mathcad are you using?
Here's the relevant section, but if you don't have the Data Analysis Extension pack installed then spline2 will not work.
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Re: Mathcad Prime 3.1, 4 and 5 Lack of features
Hello Errol,
stop wasting time on prime - it`s not worth the effort.
PTC will not longer support MC15 - Prime is **** - we have a lot of licenses and we put the work in leaving mathcad.
There seems to be no other way.
Regards
Klaus
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Re: Change in appearance of vertical lines in Prime 3
Strange are the ways of Microsoft.
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Can MathCAD do Discrete Fourier Transforms of a waveform?
Can MathCAD do Discrete Fourier Transforms of a waveform?
I am totally new to MatchCAD. I am using Excel for theses things, but it it is time consuming to fill the DFT matrice with the SIN and COS values.
The waveform can be a square wave, triangular, or similar basic wave shapes.
Follow up question would be: How to create the sample values of the original waveform, defined in continuous time?
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Re: Mathcad Prime 3.1, 4 and 5 Lack of features
I would like to follow up on my last description about the lockup. Until just recently, I had always experienced this lockup while using Mathcad v15 (which I use a lot). I can now report that I have finally experienced this same type of lockup with another application, namely MS Word. So it does not seem to be as Mathcad specific as I had originally thought. It would appear that the problem may be more of a lower level keyboard driver type of issue. I do not know if this is Windows related or if it might possibly be a driver / hardware interaction type of thing. I am running Win 7 Pro on a HP Elitebook 8540w laptop. However, I am somewhat relieved that it isn't just another Mathcad v15 issue after all and I just wanted to communicate that.
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Re: Can MathCAD do Discrete Fourier Transforms of a waveform?
Can MathCAD do Discrete Fourier Transforms of a waveform?I am totally new to MatchCAD. I am using Excel for theses things, but it it is time consuming to fill the DFT matrice with the SIN and COS values.
Sure. It's a piece of cake. Just use the FFT or CFFT functions. It will even do 2D transforms, and has built in functions to do operations based on FTs, such as convolution, autocorrelation etc.
A quote from a long time ago, from I forget where: "Mathcad is to Excel what Excel is to a pocket calculator."
The waveform can be a square wave, triangular, or similar basic wave shapes.
Follow up question would be: How to create the sample values of the original waveform, defined in continuous time?
I'm not sure what you mean. Do you have a function, and want to know the FT? Mathcad can do symbolic math as well, so in such a case it's possible that you don't need to create any sample values. If you do, it's easy to do though, but we need a better description of exactly what you are trying to do.
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Re: Mathcad Prime 3.1, 4 and 5 Lack of features
I would be very interested in learning if there is a good forum somewhere dedicated to finding a truly viable alternative to Mathcad. I am also getting desperate myself. But the solution needs to be at least as good as the Mathcad v15 feature set (on Windows preferably, but not necessarily) and there needs to be a reasonably acceptable path toward converting the over five hundred odd pages of worksheets that I have already created without having to start over again. (Although it won't be long before I will finally do just that and forever curse the creation of Mathcad/Prime and the time and effort that I have invested in it.)
Is Smath still the closest symbolic software available? I do also need all of the Mathcad v15 graphing capability. Thanks.
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Re: 3.1 Prime Spellcheck
rscott wrote:
I whole 100% disagree. Mathcad is nothing more then a word processor that had a CAS working behind the scenes
For those of you that kept say "math cad does unit!" That is the funniest thing i have ever heard!
The units are what cause 99% of errors in math cad.
Someone invented spellcheck software ooooo about 50 years ago! Your gonna tell me for $1600 PTC can't get a spellcheck going?
Give me a break
Matlab and latex both have spellchecks and who cares that this thing does the math for you. 99% of do the math by hand on a piece of paper before we try and make a report anyway.
Total garbage but for the sake of completeness I'm going to try 15 now since you say it has a spellcheck because I'm apparently the only enigeeeer enginr engineeeeer that can't spell and is only good at math.
Okay! It's clear your mind is made up.
I'm old enough that I did ALL of my math on paper, my calculating aid was originally a slide rule--an HP 45 was a major leap forward, followed by a programmable calculator, then a Sinclair (remember) running BASIC, then finally EXCEL.
Then came Mathcad, and suddenly I had a magic sheet of paper that would do the slide rule/calculator work automatically. AND, I could multiply torque by angular velocity and have my answer in horsepower, without having to remember all those horrible conversion factors--it was done for me. Further, if the formula was wrong and the units didn't balance, when I asked for horsepower a few other units showed up as well; Mathcad balanced the units, and here was a clear indication that there was something wrong that needed attention.
Now, I've been telling my cohorts (all those young engineers that think my slide rule is fascinating and learned MATLAB in college) that Mathcad will do almost anything that MATLAB will, and it will do it with units. So I take extreme issue with your "99% of errors," please dig out your yellow pad and check your math.
If you need a spell checker may I suggest Word; this program has a reasonable one and can even do some rudimentary math. And it has an equation editor so you can eliminate LATEX.
PTC is pushing Mathcad as a report generator; those of us who use it on a daily basis know better!
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Re: Inserting Sketches
My computer (Windows 7) has this neat program built-in called the snipping tool. It will do a screen grab of anything visible on your screen which can then be pushed to the clipboard for immediate paste (bitmap) into either 15 or Prime, or can be saved as an image file.
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Re: Change in appearance of vertical lines in Prime 3
My Windows 10 machine is running .NET version 4.6.1, while my Windows 7 system at work (that has broken lines) is running .Net 4.6.0. I don't know when this went to 4.6.1, Windows 10 may have done it automatically without me knowing. Unfortunately, on Windows 10, it's much harder to see which version you are running. Try this link:
How to: Determine Which .NET Framework Versions Are Installed
It may be that 4.6.1 now includes the patch that they made for PTC.
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Re: Mathcad Prime 3.1, 4 and 5 Lack of features
There's nothing out there yet to replace Mathcad. SMath is a long way away. Another future possibility is Miramath: http://miramath.newfrontierscompsoln.com/index.php?option=com_content&view=frontpage&Itemid=54. It also has a long way to go, but it's based on Python which is a good feature.
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Re: Inserting Sketches
Further to Fred's comment:
You don't need to install a separate program to grab screenshots, it's built into windows (XP...10):
[CTL-PrtScn] will grab the complete videoscreen as a bitmap, you can paste anywhere (e.g. Windows Paint app).
[Alt-PrtScn] will grab the active application window.
Success!
Luc
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Re: Can MathCAD do Discrete Fourier Transforms of a waveform?
Thanks you very much for the quick answer:
How to create the sample values of the original waveform, defined in continuous time?
To do the DFT I need a sampled waveform, which can be represented by a list of values:
Example: Cos(2PI/N); Cos(2*2PI/N); Cos(3*2PI/N).........Cos(N*2PI/N)
This list of numbers forms a vector. So, my problem is how can I generate this vector?
Probably a piece of cake, :-) Am I right?
Having this vector, I can probably do the FFT as you indicate above?
So the FFT (DFT) needs to generate a N x N matrix, but since my input is a N matrix, perhaps the FFT automatically generates the right N x N Fourier transform matrix? Is that so?
Would the output then be another N matrix? That will be another big array of numbers.
Can I plot it?
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Re: Can MathCAD do Discrete Fourier Transforms of a waveform?
Example attached (Prime 3.0)
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Re: Inserting Sketches
I suppose another option would be to use Mathcad 15 instead of Prime. 15 has the ability to insert an AutoCAD object as you were used to. 15 is available for free with any purchase of Prime (uses the same license).
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Re: Can MathCAD do Discrete Fourier Transforms of a waveform?
Define the number of points, create an index variable, fill the vector x, calculate the vector y, FFT it, plot the real and imaginary parts. However, if you are starting with a function, rather than measured data, Mathcad may be able to give you FT of the function (i.e. symbolic FT, not DFT). Doing this kind of thing in Mathcad really is an order of magnitude easier than doing it in Excel. Excel is great if you want to look at tables of numbers. I.e. if you are an accountant. For science and engineering calculations it is seriously underpowered.
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