[matlab] matlab drawing Series II 1. Cell and array conversion 2. Attribute cell 3. delete Nan value 4. Merge multiple figs into the same Fig 5. Merge multiple figs into the same axes

1: Convert decimals into fractions and extract numerators and denominators

a=2065/2013 ;
b=split(rats(a),'/')
c=str2num(b{1})
d=str2num(b{2})

b =
2×1 cell Array
{'   2065'}
{'2013  ' }

c =
2065

d =
2013

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2： Cell and array conversion

2.1： Cell rotation value array

Extract all the elements and arrange them in a column :

A={1,2,3;4,5,6;7,8,9}
%  Extract all the elements and arrange them in a column 
B1=[A{:}]'

A =
3×3 cell Array
{[1]}    {[2]}    {[3]}
{[4]}    {[5]}    {[6]}
{[7]}    {[8]}    {[9]}

B1 =
1
4
7
2
5
8
3
6
9

Convert a numerical cell array to a numerical array :

A={1,2,3;4,5,6;7,8,9};
%  Convert a numerical cell array to a numerical array 
B2=cell2mat(A)
%  The following methods are also acceptable, but the speed is slow 
% B2=reshape([A{:}],size(A))

B2 =
1     2     3
4     5     6
7     8     9

String cell to cell numeric array :

C={'12','34';'56','78'}
D=reshape(str2num(char(C)),size(C))

C =
2×2 cell Array
{'12'}    {'34'}
{'56'}    {'78'}

D =
12    34
56    78

2.2： Numerical array to cell

Block and transform cells

A=[1,2,3;4,5,6]
%  The line is divided into two pieces, one for each 
%  The column is divided into two parts 1 Row sum 2 That's ok 
B=mat2cell(A,[1,1],[1,2])

A =
1     2     3
4     5     6

B =
2×2 cell Array
{[1]}    {[2 3]}
{[4]}    {[5 6]}

No block to cell , The following two methods are equivalent , But obviously, the second method is much simpler ：

A=[1,2,3;4,5,6];

B1=mat2cell(A,ones(1,size(A,1)),ones(1,size(A,2)))

B2=num2cell(A)

B1 =
2×3 cell Array
{[1]}    {[2]}    {[3]}
{[4]}    {[5]}    {[6]}

B2 =
2×3 cell Array
{[1]}    {[2]}    {[3]}
{[4]}    {[5]}    {[6]}

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3： Attribute cell

For this property, you need to set it repeatedly many times :

x=0:.2:4*pi;

hold on
plot(x,sin(x),'-s','LineWidth',2,'MarkerSize',10);
plot(x,sin(0.5.*x),'-^','LineWidth',2,'MarkerSize',10);
plot(x,sin(x).^2,'-o','LineWidth',2,'MarkerSize',10);

Save it in the cell array ：

x=0:.2:4*pi;

hold on
tc={'LineWidth',2,'MarkerSize',10};

plot(x,sin(x),'-s',tc{:});
plot(x,sin(0.5.*x),'-^',tc{:});
plot(x,sin(x).^2,'-o',tc{:});

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4: Delete nan value

One dimensional vector ：

oriData=[1 nan nan 4 nan 5 6]
oriData(isnan(oriData))=[]

oriData =
1   NaN   NaN     4   NaN     5     6

oriData =
1     4     5     6

Delete with nan The line of ：

oriData=[1 2;nan 4;5 6;7 nan]
tData=sum(oriData,2);
oriData(isnan(tData),:)=[]

oriData =
     1  2
NaN    4
     5    6
     7   NaN

oriData =
1     2
5     6

Of course, if you want to delete nan The column of , Change the code to ：

tData=sum(oriData,1);
oriData(:,isnan(tData))=[]

Of course, draw inferences from one instance , use isinf Function can delete infinite value .

5: Get workspace variables

as everyone knows whos Function can get the current workspace variable ：

And in functions or in app in ,whos The function gets the variables in the current field instead of the workspace variables . have access to evalin The function get is specified as base Variables in the workspace ：

evalin('base','whos')

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6: Merge multiple fig For the same fig

If we had two fig file , Respectively called 1.fig,2.fig：

Merge into one fig Code ：

fig1=open('1.fig');
fig2=open('2.fig');

figure()
ax1=subplot(2,1,1);
copyobj(fig1.Children.Children,ax1)
delete(fig1)

ax2=subplot(2,1,2);
copyobj(fig2.Children.Children,ax2)
delete(fig2)

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7: Merge multiple fig To the same axes

Still use some fig file ：

fig1=open('1.fig');
fig2=open('2.fig');

figure()
ax=gca;
copyobj(fig1.Children.Children,ax)
copyobj(fig2.Children.Children,ax)

delete(fig1)
delete(fig2)