Skip to main content
M
MahmoudMagdy1-Visitor
1-Visitor
December 4, 2018
Solved

Mathcad Prime 4.0 Plotting failed. Replace complex values and NaNs by real numbers. need help- asap

  • December 4, 2018
  • 3 replies
  • 4777 views

Hello,

 

I have this problem which says Plotting failed. Replace complex values and NaNs by real numbers. Although I identified the units and the parameters. Need help ASAP please.

1.jpg

 

2.jpg

 

 

Thanks in advance.

Best answer by Fred_Kohlhepp

Your calculation resulted in an array of arrays, that's what the square brackets around each element means.

Capture.PNG

That won't plot.

3 replies

L
LucMeekes23-Emerald IV
23-Emerald IV
December 4, 2018

Attach your Prime worksheet, not just a picture.

 

Luc

M
MahmoudMagdy1-VisitorAuthor
1-Visitor
December 4, 2018

Okay, here it is.

F
Fred_Kohlhepp23-Emerald IAnswer
23-Emerald I
December 4, 2018

Your calculation resulted in an array of arrays, that's what the square brackets around each element means.

Capture.PNG

That won't plot.

    M
    MahmoudMagdy1-VisitorAuthor
    1-Visitor
    December 4, 2018

    can you solve it and send me the file ? 'cause I didn't make double arrays in equations :S

    F
    Fred_Kohlhepp23-Emerald I
    23-Emerald I
    December 4, 2018

    I've got Express 4.0.  I was able to open your file, but I cannot program, so where you were programming values I had to pick just one (two pink highlighted expressions.

     

    Attached as mathcad and pdf

      W
      Werner_E25-Diamond I
      25-Diamond I
      December 4, 2018

      1) Your definition of function S.J uses sigma and sigma is not a single value but a vector of values. Thats the rerason S.J returns a nested  matrix which can't be plotted.

      One way round is to define S.J as a function of two arguments omega and sigma

      B1.PNG

       

      2) In your plot you added extra units rad/s for omega when calling S.J. This is wrong as omega already has the correct units. Furthermore the axis limits you had chosen are far too big

      B2.PNG

      unless you want the plot be displayed in different units

      B3.PNG

      Worksheet in P5 format attached

       

        Terms & ConditionsAccessibility statement