rm unsupported LaTeX macros from README (operatorname -> text)

Author: Carol-seven

README.Rmd

@@ -39,8 +39,8 @@ matrix, making them user-friendly and useful for researchers and practitioners.
 
 $$
 \hat{\Omega}(\lambda,\alpha,\gamma)
-= {\arg\min}_{\Omega \succ 0} \Bigl\{ - \log\det(\Omega) +
-\operatorname{tr}(S\Omega) + P_{\lambda,\alpha,\gamma}(\Omega) \Bigr\},
+= {\arg\min}_{\Omega \succ 0} \Bigl\{ - \log\det(\Omega) + \text{tr}(S\Omega) +
+P_{\lambda,\alpha,\gamma}(\Omega) \Bigr\},
 $$
 $$
 P_{\lambda,\alpha,\gamma}(\Omega)

README.md

@@ -18,8 +18,8 @@ incorporate both element-wise and group-wise penalties to estimate a precision
 matrix, making them user-friendly and useful for researchers and practitioners.
 
 $$\hat{\Omega}(\lambda,\alpha,\gamma)
-= {\arg\min}_{\Omega \succ 0} \Bigl\{ - \log\det(\Omega) +
-\operatorname{tr}(S\Omega) + P_{\lambda,\alpha,\gamma}(\Omega) \Bigr\},$$
+= {\arg\min}_{\Omega \succ 0} \Bigl\{ - \log\det(\Omega) + \text{tr}(S\Omega) +
+P_{\lambda,\alpha,\gamma}(\Omega) \Bigr\},$$
 
 $$P_{\lambda,\alpha,\gamma}(\Omega)
 = \alpha P^\text{individual}_{\lambda,\gamma}(\Omega) +

vignettes/pen_est.Rmd

@@ -42,8 +42,8 @@ Consider the following setting:
 
 $$
 \hat{\Omega}(\lambda,\alpha,\gamma)
-= {\arg\min}_{\Omega \succ 0} \Bigl\{ - \log\det(\Omega) +
-\operatorname{tr}(S\Omega) + P_{\lambda,\alpha,\gamma}(\Omega) \Bigr\},
+= {\arg\min}_{\Omega \succ 0} \Bigl\{ - \log\det(\Omega) + \text{tr}(S\Omega) +
+P_{\lambda,\alpha,\gamma}(\Omega) \Bigr\},
 $$
 $$
 P_{\lambda,\alpha,\gamma}(\Omega)