How to modify the subcaption "Figure 1a" to "Figure 1 (a)"?
\documentclass[12pt]{article}
\usepackage{blindtext}
\usepackage{graphicx,psfrag,epsf}
\usepackage{epstopdf}
\usepackage{float}
\usepackage[export]{adjustbox}
\usepackage{mathtools}
\usepackage{verbatim}
%\usepackage[subrefformat=parens,labelformat=parens, labelsep=quad]{subfig}
\usepackage{subfigure}
\usepackage{caption}
%\usepackage{subcaption}
\newcommand{\bs}{\boldsymbol}
\renewcommand\thesubfigure{\alph{subfigure}}
% correct bad hyphenation here
%\pdfminorversion=4
% NOTE: To produce blinded version, replace "0" with "1" below.
\newcommand{\blind}{0}
% DON'T change margins - should be 1 inch all around.
\addtolength{\oddsidemargin}{-.5in}%
\addtolength{\evensidemargin}{-.5in}%
\addtolength{\textwidth}{1in}%
\addtolength{\textheight}{-.3in}%
\addtolength{\topmargin}{-.8in}%
\begin{document}
The Figure~\ref{descriptive1} is composed by Figure~\ref{fig:hist_longair} and Figure~\ref{fig:curve_longair}.
\begin{figure}[H]
\center
\subfigure[Histogram]{\includegraphics[width = .42\linewidth]{hist_longair.eps} \label{fig:hist_longair}}%
\quad%
\subfigure[Contour curve]{\includegraphics[width = .42\linewidth]{curve_longair.eps}\label{fig:curve_longair}}%
\caption{Histogram, contour curve and symbolic scatterplot of $\bs{Y}$}
\label{descriptive1}
\end{figure}
\end{document}

subfigurepackage is deprecated. Usesubfigorsubcaptioninstead. – Mico Jan 27 '17 at 04:00