# 数学代写|matlab代写|ENR-261

## 数学代写|matlab代写|Vectors of Nested Structures

Combining vectors and nested structures, it is possible to have a vector of structures in which some fields are structures themselves. Here is an example in which a company manufactures cylinders from different materials for industrial use. Information on them is stored in a data structure in a program. The variable cyls is a vector of structures, each of which has fields code, dimensions, and weight. The dimensions field is a structure itself consisting of fields rad and height for the radius and height of each cylinder.
code dimensions weight
\begin{tabular}{|l|l|l|l|}
\hline $\mathrm{x}$ & 3 & 6 & 7 \
\hline $2 \mathrm{a}$ & 1 & 2 & 5 \
\hline $3 \mathrm{C}$ & 3 & 6 & 9 \
\hline
\end{tabular}
The following is an example of initializing the data structure by preallocating:
$\gg>\operatorname{cyls}(3)=\operatorname{struct}\left(\right.$ code=’ $c^{\prime}$. dimensions=…
struct $($ rad $=3$, height $=6)$. weight $=9)$ :
$\gg>\operatorname{cyls}(1)=\operatorname{struct}($ code-‘ $x$ ‘. dimensions $=.$.
struct $($ rad $=3$, height $=6)$, weight $=7)$ :
$\gg c y 1 s(2)=\operatorname{struct}\left(\right.$ code=’ $a^{\prime}$. dimensions=…
struct $(\operatorname{rad}=4$, height=2). weight $=5)$ :
There are several layers in this variable. For example:

• cyls is the entire data structure, which is a vector of structs
• cyls(1) is an individual element from the vector, which is a struct
• cyls (2). code is the code field from the struct cyls(2); it is a char
• cyls (3).dimensions is the dimensions field from the struct cyls(3); it is a struct itself
• cyls(1).dimensions. rad is the rad field from the struct cyls(1).dimensions; it is a double number

For these cylinders, one desired calculation may be the volume of each cylinder, which is defined as $\pi^{\star} r^2 \star h$, where $r$ is the radius and $h$ is the height. The following function printcylvols prints the volume of each cylinder, along with its code for identification purposes. It calls a local function to calculate each volume.

## 数学代写|matlab代写|Categorical Arrays

Categorical arrays are a type of array that allows one to store a finite, countable number of different possible values. Categorical arrays are defined using the categorical function.

For example, a group is polled on their favorite ice cream flavors; the results are stored in a categorical array:
$\gg>$ icecreamfaves=categorical ( $’ V a n i 11 a$ ‘. ‘Chocolate’. …
‘Chocolate’. ‘Rum Raisin’. ‘Vanilla’, ‘Strawberry’. …
‘Vanilla’. ‘Chocolate’. ‘Strawberry’. ‘Chocolate’l);
Another way to create this would be to store the strings in a cell array, and then convert using the categorical function:
$\gg>$ cellicecreamfaves ${$ ‘Vanilla’. ‘Chocolate’….
‘Chocolate’. ‘Rum Raisin’. ‘Vanilla’, ‘Strawberry’….
‘Vanilla’. ‘Chocolate’. ‘Strawberry’. ‘Chocolate’।
$\gg\rangle$ icecreamfaves=categorical (cel1 icecreamfaves):
There are several functions that can be used with categorical arrays. The function categories will return the list of possible categories as a cell column vector, sorted in alphabetical order.
$\gg$ cats=categories (icecreamfaves)
cats $=$
$5 \times 1$ cel1 array
[‘Chocolate’ ]
(‘Strawberry’|
[‘Vani1]a’
The functions summary and countcats will show the number of occurrences of each of the categories.
$\gg$ summary(icecreamfaves)
$\begin{array}{rrrrr}\text { Chocolate Rocky Road } & \text { Rum Raisin Strawberry } & \text { Vanilla } \ 6 & 2 & 1 & 2 & 3\end{array}$
$\gg$ countcats (icecreamfaves)
ans= $\begin{array}{lllll}6 & 2 & 1 & 2 & 3\end{array}$
In the case of the favorite ice cream flavors, there is no natural order for them, so they are listed in alphabetical order. It is also possible to have ordinal categorical arrays, however, in which an order is given to the categories.
For example, a person has a wearable fitness tracker that tracks the days on which a personal goal for the number of steps taken is reached; these are stored in a file. To simulate this, a variable stepgoalsmet stores these data for a few weeks. Another cell array stores the possible days of the week.

# matlab代考

## 数学代写|matlab代写|Vectors of Nested Structures

\begin{tabular}{|l|l|l|l|} \hline $\mathrm{x}$ & 3 & 6 & 7 \\hline $2 \mathrm{a}$ & 1 & 2 & 5 \\hline $3\mathrm{C}$&3&6&9\\hline\end{表格}\begin{tabular}{|l|l|l|l|} \hline $\mathrm{x}$ & 3 & 6 & 7 \\hline $2 \mathrm{a}$ & 1 & 2 & 5 \\hline $3\mathrm{C}$&3&6&9\\hline\end{表格}

≫>圆柱体⁡(3)=结构⁡(代码=’C′. 尺寸=…

≫>圆柱体⁡(1)=结构⁡(代码-‘X’。方面=..

≫C是1s(2)=结构⁡(代码=’一个′. 尺寸=…

• cyls 是整个数据结构，它是一个结构体向量
• cyls(1) 是向量中的单个元素，它是一个结构
• 圆柱体 (2)。code 是 struct cyls(2) 中的代码字段；这是一个字符
• cyls (3).dimensions 是结构 cyls(3) 中的维度字段；它本身就是一个结构

## 数学代写|matlab代写|Categorical Arrays

≫>icecreamfaves=分类（′在一个n一世11一个’。’巧克力’。……
“巧克力”。“朗姆酒葡萄干”。’香草’，’草莓’。……
“巧克力”。’石板路’。’巧克力’。“洛基路”，……
“香草”。’巧克力’。’草莓’。’巧克力’l);

≫>cellicecreamfaves ${।‘在一个n一世ll一个′.‘CH○C○l一个吨和′….‘CH○C○l一个吨和′.‘R在米R一个一世s一世n′.‘在一个n一世ll一个′,‘小号吨r一个在b和rr是′….‘CH○C○l一个吨和′.‘R○Cķ是R○一个d′.‘CH○C○l一个吨和′.‘R○Cķ是R○一个d′.…‘在一个n一世ll一个′.‘CH○C○l一个吨和′.‘小号吨r一个在b和rr是′.‘CH○C○l一个吨和′।\gg\拨浪鼓一世C和Cr和一个米F一个在和s=C一个吨和G○r一世C一个l(C和l1一世C和Cr和一个米F一个在和s):吨H和r和一个r和s和在和r一个lF在nC吨一世○ns吨H一个吨C一个nb和在s和d在一世吨HC一个吨和G○r一世C一个l一个rr一个是s.吨H和F在nC吨一世○nC一个吨和G○r一世和s在一世llr和吨在rn吨H和l一世s吨○Fp○ss一世bl和C一个吨和G○r一世和s一个s一个C和llC○l在米n在和C吨○r,s○r吨和d一世n一个lpH一个b和吨一世C一个l○rd和r.\ggC一个吨s=C一个吨和G○r一世和s(一世C和Cr和一个米F一个在和s)C一个吨s=5×1C和l1一个rr一个是[‘CH○C○l一个吨和′][‘R○Cķ是R○一个d′](‘小号吨r一个在b和rr是′|[‘在一个n一世1]一个′吨H和F在nC吨一世○nss在米米一个r是一个ndC○在n吨C一个吨s在一世llsH○在吨H和n在米b和r○F○CC在rr和nC和s○F和一个CH○F吨H和C一个吨和G○r一世和s.\ggs在米米一个r是(一世C和Cr和一个米F一个在和s) 巧克力洛基路 朗姆酒葡萄干草莓 香草 62123\ggC○在n吨C一个吨s(一世C和Cr和一个米F一个在和s)一个ns= 62123$

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