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Unbrackable blanck

asked 2020-10-26 18:21:08 +0200

Cyrille gravatar image

updated 2020-10-26 18:21:51 +0200

In the following code I am obliged to insert / to inside my fonction to obtain the desired result.

nl=3 #nombre de contraintes
nc=4  #nombre de variables
ring=QQ
A=matrix(ring,nl,nc,[1.5,2,4,3,4,1,2,1,2,3,1,2])
b=vector(ring,[550,700,200])
c=vector(ring,[4,6,3,1]) 

### code ####
def simplex_tableau_sf(A, b, c,cond=1) :
    # A matrice des contraintes
    # b vecteur des contraintes
    # c vecteur des paramètres de l'objectif
    # 1 (défaut) tableau

    I=identity_matrix(A.nrows())
    L=block_matrix([[A,I]],subdivide=False)
    L=L.augment(b)
    n=A.nrows()
    m=A.ncols()
    z1=vector([0 for i in range(n+1)])
    c=flatten(-c)
    z1=flatten(z1)
    zc=vector(c+z1)
    L=matrix(L.rows()+[zc])
    rows = list(L)
    hr=['$x_{}$'.format(i) for i in range(0,nc+nl)]
    hr=list('')+list(hr)+list('b')
    hc=list('xc2')+['$x_{}$'.format(i) for i in range(4,7)]
    t = table(rows, header_row=hr, header_column=hc, frame=True)
    if cond == 1 :
        return t
    elif cond != 1 :
        return L

So is there a blank which can be used as a string

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Comments

Can you clarify? It is not clear what you are asking. In Python, ' ' is a blank string. In LaTeX, '~' is a blank.

John Palmieri gravatar imageJohn Palmieri ( 2020-10-26 22:47:33 +0200 )edit

John look the difference when I use hr=list('/')+list(hr)+list('b'), hr=list(' ')+list(hr)+list('b') and hr=list('/')+list(hr)+list('b'). The only case where I obtain a correct result is the first and I want to have a blanc space not a \.

Cyrille gravatar imageCyrille ( 2020-10-28 19:17:27 +0200 )edit

What happens if you use ' ' rather than ''?

John Palmieri gravatar imageJohn Palmieri ( 2020-10-28 19:56:39 +0200 )edit

Sorry John, I send the wrong code. I have changed it in the question. I hope now it is correct. My problem is only with the /. Now with ' ', it works. I don't know why earlier, I have a wrong result.

Cyrille gravatar imageCyrille ( 2020-11-01 12:21:42 +0200 )edit

Quick comment: you can replace elif cond != 1 : with else:

John Palmieri gravatar imageJohn Palmieri ( 2020-11-02 19:57:16 +0200 )edit

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answered 2020-10-28 20:03:25 +0200

Here is a screenshot of what your code produces for me (using Sage 9.2):

image description

If I change '' to '/', it adds an extra column to the header row, so that the column "b" has nothing beneath it. Is that really what you want?

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Asked: 2020-10-26 18:21:08 +0200

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Last updated: Oct 28 '20