Printing a list of simultaneous equations
Don't use the default print method then. When you type an expression alone at the console it uses a print function to convert the result to characters for output. The default print method for matrices of character uses quotes to show the exact contents of each character string. Convert the matrix to a single string using paste for each line, then paste the lines together with newlines, then cat the string to the console. You will probably find that converting the individual elements into strings with uniform string length (using sprintf?) as you add them into the matrix makes the final output look better.
On January 18, 2019 4:02:09 AM PST, "Sorkin, John" <jsorkin at som.umaryland.edu> wrote:
I am trying to print a list of equations in an easily readable form. At
this time all I can get is a series of characters enclosed in
quotation marks rather than equations with numbers and equal signs.
What I get is
y equalsigns x z
eq1 "0.5" "=" "1" "2"
eq2 "4" "=" "2" "3"
When what I want is
y x z
eq1 0.5 = 1 2
eq2 4.0 = 2 3
I am enclosing my R code below:
# Create matrix of coefficients of independent variables.
a <- matrix(c(1,2,2,3),nrow=c(2,2),byrow=TRUE)
dimnames(a)<-list(c("eq1","eq2"),c("x","z"))
cat("Matrix of independent variables\n")
a
# Create vector of dependent variables.
b <- matrix(c(0.5,4.0),nrow=c(2,1))
dimnames(b)<-list(c("eq1","eq2"),c("y"))
cat("Vector of dependent variables","\n")
b
cat("System of equations to be solved")
equalsigns <- c("=","=")
cbind(b,equalsigns,a)
Thank you,
John
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and
Geriatric Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing)
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