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I have to use the \documentclass[<options>]{cas-dc} , and also I have used the following packages in my document in Latex. The default style of the summation symbol in the document class cas-dc is:

enter image description here

How can I change it to the following style?

enter image description here

\documentclass[a4paper,fleqn]{cas-dc}
\usepackage{lipsum,capt-of,graphicx}
\usepackage{geometry}
\usepackage{natbib}

\usepackage{ragged2e}
\usepackage{setspace}
\usepackage[labelfont=bf,justification=raggedright,singlelinecheck=false, font={footnotesize}]{caption}
\captionsetup[figure]{name=Fig. ,labelsep=period, justification=justified, singlelinecheck=off}
\captionsetup[table]{labelsep=newline,font=footnotesize, justification=justified, singlelinecheck=off}
\usepackage{subcaption}
\usepackage{etoolbox}
\AtBeginEnvironment{table}{\sffamily}
\usepackage{booktabs,siunitx, multirow}

\usepackage{amsmath}
\usepackage{adjustbox}
\usepackage{floatrow}
\floatsetup[table]{style=Plaintop, captionskip=0pt, capposition=top}


\begin{document}
\begin{equation*} \label{eq:Vpi(s)}
T = \sum_{t=0}^{M-1}f(x)
\end{equation*}
\end{document} 
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    Welcome to TeX.SE! The class cas-dc uses the Stix font (a Times New Roman variant), that contains the symbol in your screenshot as the sum symbol. You may be able to change that (see for example tex.stackexchange.com/questions/85991/… and tex.stackexchange.com/questions/14386/…) but it is intended to be like this, if you use the class to submit to an Elsevier publication then it will be changed back to the default symbol by the publisher.
    – Marijn
    Dec 7, 2020 at 18:55
  • You shouldn't use caption and subcaption with this class, which has its own method for typesetting captions. Possibly floatrow is another no-go.
    – egreg
    Dec 7, 2020 at 21:04

1 Answer 1

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You can add the following lines at the end of your preamble to redefine \sum to be the summation symbol used with computer modern.

\let\sum\relax
\DeclareSymbolFont{otherlargesymbols}{OMX}{cmex}{m}{n}
\DeclareMathSymbol{\sum}{\mathop}{otherlargesymbols}{"50}

Here's the output with these added lines.

However, as said by @Marjin in the comments, I would not recommend to do that if it is to submit a manuscript, since the publisher probably needs that you stick with the font used in their document class.

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  • thanks.......... Dec 7, 2020 at 20:34
  • Many compliments for your 10k...I am very happy to give +10 for this answer.
    – Sebastiano
    Dec 8, 2020 at 20:36
  • 1
    @Sebastiano Thank you very much!
    – Vincent
    Dec 8, 2020 at 20:44

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