Mathcad

I am trying to make a comprehensive UNIFAC model program (it is an activity coefficient model used in chemical engineering). Currently I have it running and it works correctly, except for the user to be able to use this program for any size mixture system, they must edit the component matrices manually. For instance, if there are two species in the mixture, the user must edit the first vector to have two components and input the corresponding values, and they must edit the second matrix to have two rows and then they must input the corresponding values. What I want my program to be able to do is have the user input the number of components and this variable will produce both the vector and the matrix of the correct corresponding sizes. After these are created, then the user needs to be able to edit the values of the matrix and input the data that they need to run. I know how to make both vectors and matrices of variable sizes but what I need help with is making these resultant vectors

There's no error in the worksheet, but the answer is incorrect. How do i define in Mathcad so that it would read each scalar in the array instead of a whole.  (Mathcad 15)

Mathcad predict function and Rub/$ ratio

At the moment my students work with sin, cos , tan. As simple equation the should calculate the intervall where  5sin(x) is at least 3. In Prime 5 one gets the (first) 2 solutions at once: But in Prime 6 there is only one solution:  To get the 2. solution one has to use the "solver block" which makes things complicated. Why is it that P6 can solve fewer equations than 5 and sometimes gives fewer solution and I cannot find a way to get all the solutions with solve?? Bug or Feature ??? I figured that "new calculation engine" means better calculation engine ....

Hi,  I have a problem when using a defined vector in a function. As you can see below, the variable (i), goes from 1 to 3 with increments of 1. When I use this variable in the function Dl(i) and Di(i) it returns one extra value in the answer, (0). (See where the arrow is pointing in the picture below)   This becomes a problem when I later on is going to use i.e. Di(i) in the equation shown below: What I want to do is to remove this "extra" 0 for all functions of (i) Anyone that can help me out?

Mathcad 15 M50 Error: The Operation Completed Successfully. v15 is needed to open and convert older file formats, but V15 will not run. Windows 10 64bit, users do not have admin rights.  

Hello,   I'm working on a sheet which should update the options in a second (and third) list-boxes based on the selection of the first and second. (ie. selection a type of steel elements, the second list populates the options for steel grade depending of the element type selected).   The bug is that the later boxes don't update until they're clicked on. I want the lists to update automatically once the previous selections are completed.    I'm fairly new to the control script so I think the issue likely lies in my sequence.    Any help?

It is the Mathcad-solution this Alphabetical Puzzle in my old book! Can you recreate Mathcad-sheet?

Ran across this: Has this been seen before? And how do Mathcad 15 and Prime fare? Hmm: This I can check in Prime Express: No error either...   Luc

I work at a large university and just found out that our computer people are uninstalling the few remaining seats of Mathcad in my college (if a university was a company, a college would be a division). Unhappily, Mathcad is effectively being removed from my college. We can buy licenses for $500 per seat, but there isn't enough money; 50 seats would be $25,000.I had planned to stick with MCAD 15 for another year or two, but I'm afraid circumstances may be forcing my hand. If you were going to introduce a number crunching program to undergraduate students who often have no prior experience, which of these would you pick:- Mathematica- MATLAB- MapleThese are all widely available on campus and there is a user base to rely on. I like MATLAB and it's really easy to get (Amazon), but the programming interface is dated and simulink has a learning curve. Maple is easy to get (Amazon), seems to be both easy to learn and capable. Mathematica is very powerful and easy to get, but there is a learn

Hi. Does any one in the forum know if Mathcad can be used to evalate a result and report if the solution is placed outside a predefined range.   For example. I expect to recieve a result between 1 and 5. If the result ends up in a value of e.g. 10 I want to be able to read that the result is out of range. Preferably in a warning message.

Hello All, Happy New Year,      I am attempting to complete a curve fitting with Bessel functions as described in the reference below. The core concept is the minimization of the coefficients ck of the Hankel transform. See screenshot below.        I am not familiar enough with Mathcad to put together the code at first sight.      (I found the minimize function, but as far I can tell, it would work on the variable r which isn't the parameter needing optimization.)        Could please someone  direct me to a template I can use for the task ?   For clarification * r radius * f(r) (discrete) thickness profile * ck coefficient of the Bessel decomposition * f(r)^ simulated function * Q cost function for minimization * Qo(n) cost function w/ minimized coefficients ck   The challenging task, I need with, is the minimization of the function Q, acting on the ck coefficients.   Thanks for the support, &nbs

Team,   I'm trying to use the Mathcad minerr function with a recursive equation. Ideally, the terms, r, tau, alpha, and K would be found, using initial "guess" values, Kindly see the attached sheet.    Thanks, Glen Atlas, MD, MSc  

Hello why can I not solve this I want to solve Q to me in [m^3/hr]

If you try to edit any data (for example a single numerical character) in the program sections of the attached worksheet you have to wait 2 or 3 seconds before getting a reaction. This makes very difficult to continue to add new lines of program. Is this behaviour connected to intrinsic capabilities of Prime? Thank you

I'm using Mathcad Prime 5.0.   I have the following function defined. The intent if for this function to be very generic and allow any number of inputs.  Therefore, Vin and Rin are vectors of the same length.  Here's how those are setup. The function itself works fine.  Now, I need to take the derivative of that function with respect to the individual components of Rin.  The intent is to estimate how much effect the variation of each individual component has on the overall output.  Ultimately the expression and number of parameters will be bigger than what I've shown here.  I just scaled everything back to a simpler example to illustrate the actual problem.  I was hoping the derivative with respect to Rin would give me a vector of the numerically evaluated derivative with respect to each individual resistance.  Instead it tells me everything has to be scalar. I found some old posts similar to this dating back to 2004 and 2005.  They

With cone? plane and ellipse all is cleare. See please cone, plane, parabola  Thanks! And what about a parabola?  I know O-F - can I calculate the theta? Can the cone axis goes through the focus of the parabola?

How to solve "y" valve in the attached equation   Regards,   Robert

Hi,   I am attempting to dynamically model the behaviour of granular solids in a rotary kiln using known equations, however i am having trouble setting up the following ODEs in mathCAD for the model....can anyone help. I have included the key points i am trying to model in Mathcad.       boundary condition:  where h0 is a fixed value (say 10% of the value of R).   From the above i'm looking to be able to determine the bed height (h) at any axial location (z) along the kiln tube.   Subsequently equations for Cross section area of the granular bed and residence time of the granular transport through the kiln (as a function of bed depth (h)) follow on from this...   Cross section area:   Residence time So essentially i am looking to use MatCAD to find the residence time (t), given fixed values for: n (rotation speed in rpm), R (radius of kiln in m), D (diameter of kiln in m), angle of repose of the material (beta), angle of inclination of th

Hello folks,   I'm having an issue with the reference to another worksheet. I referenced several worksheets in order to compare results only to find prime having a tantrum claiming there is an error in the source sheet. However, when opening the source sheet everything seems to be fine. It get's even weirder: when using a reference in another sheet the data from the source sheet (the one Prime claims to have an error) just loads fine.   Has anybody else had the same issue and does anybody know a remedy?   Raiko   P.S. I'm not at liberty to provide the sheet, sorry.

Hello  URGENT HELP NEEDED! I have this expression and conditions   phi has conditonal values depending on L. Since L is in the denominator, and is varied from 0-30 nm and more. this expression is giving divide by zero error. How can I compute the valus of phi. I want to plot potential (phi) againt L. Please help Thank you  

I am trying to create a conditional program, that returns a value if the input is within a data set, but an error if the input value is outside the bounds of the data set. Unfortunately, the return value is in a non-default unit (psi*ms). Thus, if I just set the formula to show the default result, the displayed units are not what I want. However, if I go in and set the units to my desire value in the result, the display will then "crash" if it tries to return the error message. Is there a way to get mathcad to "ignore" the units if it is returning text? The worksheet in question is very busy, so I have isolated an example of the idea in the attached sheet. Basically, I want Impulse(6) to return a value in psi-ms, but Impulse(2) to return the error message. Is there any way to get Mathcad Prime to do this? Thanks in advance,