3
Your code fragment is fine. You should see figures:
If you not, than you have something in document, what you not show us. So you need always to provide MWE (Minimal Working example) which reproduce your problem and not only a code fragment. My testing MWE is:
\documentclass[twocolumn]{article}
\usepackage{graphicx}
\usepackage{subcaption}
\begin{document}...
2
Tikz is used to clip and position the image (stored in a savebox) on the page. Don't forget to run it twice.
\documentclass{article}
\usepackage[a4paper]{geometry}
\pagestyle{empty}
\usepackage{tikz}
\newsavebox{\master}
\savebox{\master}{\includegraphics[width=2\paperwidth, height=\paperheight]{example-image}}
\begin{document}
\begin{tikzpicture}[...
2
if figure and table are in the same float, they will be placed on the same page
\documentclass{article}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{rotating}
\usepackage{pdflscape}
\begin{document}
\begin{sidewaystable}
\centering
\begin{tabular}{cc}
a & b \\
a & b \\
\end{tabular}
\caption{Caption}
\vspace{1cm}
\...
2
This is primarily based on how LaTeX processes the optional argument to a float. In essence, it captures the optional argument in a different macro (\@fps, specifically), then attempts to expand that macro by looking at it's \meaning. Then it sequentially processes the characters of the meaning. However, the capturing process uses \def, similar to the ...
1
A common misconception is that a tabular environment needs a table environment around it. This is not true: to TeX, a tabular is just like a big character (a box, in more correct terminology), with its vertical and horizontal sizes and its reference point (that can be influenced by using the [t] or [b] options to \begin{tabular}).
The same holds for \...
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