
#1
Sep2007, 07:41 AM

P: 17

1. The problem statement, all variables and given/known data
a. How do I write vectors bold within displaymath and frac. I want Phi, r and r_1 bold. But get G M_1 bold as well = bad. b. How do I use arrows instead of the bold notation? 3. The attempt at a solution \begin{displaymath} a1. textbf{\Phi(r)} = \frac{G M_1}{ textbf{r}textbf{r_1} } \end{displaymath} a2. \bf{\Phi}(\bf{r}) = \frac{G M_1}{ \bf{r}\bf{r_1} } 



#2
Sep2007, 08:13 AM

P: 301

Arrows: \vec : [tex]\vec \Phi ( \vec r) = \frac{G M_1}{ \vec{r}\vec r_1 } [/tex]
Bold: \mathbf : [tex]\mathbf{\Phi}( \mathbf{r}) = \frac{G M_1}{ \mathbf{r}\mathbf{r_1} } [/tex] I don't think you really want the potential to be a vector, but that's what your code implied, so I kept it. 



#3
Sep2007, 08:34 AM

Mentor
P: 14,477

\textbf{\Phi(r)} = \frac{G M_1}{ \textbf{r}\textbf{r_1} } [tex]\textbf{\Phi(r)} = \frac{G M_1}{ \textbf{r}\textbf{r_1} }[/tex] \bf doesn't work at all: \bf{\Phi}(\bf{r}) = \frac{G M_1}{ \bf{r}\bf{r_1} } [tex]\bf{\Phi}(\bf{r}) = \frac{G M_1}{ \bf{r}\bf{r_1} }[/tex] Timo suggested \mathbf, but that doesn't work on some things. If you have access to the AMSLaTeX macros, (and you should), use \boldsymbol. \boldsymbol{\Phi}(\boldsymbol{r}) = \frac{G M_1}{ \boldsymbol{r}\boldsymbol{r}_1 } [tex]\boldsymbol{\Phi}(\boldsymbol{r}) = \frac{G M_1}{ \boldsymbol{r}\boldsymbol{r}_1 }[/tex] An even better solution is to define your own vector macro that formats vectors the way you want them to appear. For example, \newcommand{\vect}[1]{\boldsymbol{#1}}Then when someone tells you to format your vectors with arrows instead you can simply change that one macro. \newcommand{\vect}[1]{\vec{#1}}Bold symbols are used for things other than vectors (matrices, for example). A global searchandreplace is not a good idea. 



#4
Sep2007, 09:01 AM

P: 17

Latex vector notation.
Thanks, that works great!



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