How to scatter plot

Question

Arif 2024-4-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2105211-how-to-scatter-plot

评论： Voss 2024-4-12

采纳的回答： Voss

在 MATLAB Online 中打开

hi guys, im trying to plot my X,Z coordinate to a scatter plot. My problem is shown in figure below:

It is becuase my X is a 1x16 double and my Z is a 1x32 double. When i do [X1,X2], it just reads X1 because X1 and X2 has same value in each variable.

Here are my code :

clear;
clc;
H = 5;
L = 15;
Ns = 2;
Nb = 1;
PortalHeight = H;
Bayspan = L;
NumberStory = Ns;
NumberBay = Nb;
%Variable1
h = [0.8,1.00,1.20,1.40,1.6,1.80];
%Variable2
Lss = [2.00,2.40,2.80,3.20,3.60,4.00]
%Variable3
Nss = [2,3,4];
Var1HeightTrussBeam = h;
Var2LengthSpecialSegment = Lss;
Var3NumberSpecialSegment = Nss;
%% XZ Column
for i = 1:NumberBay+1
    Xcolumn(i)=L*(i-1);
    Xbotbeam(i)=L*(i-1);
end
for j = 1:NumberStory+1
    Zcolumn(j) = H*(j-1);
    Zbotbeam(j)=(H*(j-1)-h(1));
end
Zbotbeam = Zbotbeam(1,[Ns,Ns+1]);
%calculate segment length of ordinary segment 
Los = (L-Lss(1))/2;
Nos = Los/h(1);
Nos = round(Nos);
los = Los/Nos;
checkspan = logical(los*Nos*2+Lss(1)==15)
assert(logical(los*Nos*2+Lss(1)==15),"span must be 15m");
%% 1st Story
%XZ first top and bottom ordinary segment(os)
XTopOrdinarySegment = repmat(0,1,(NumberBay)*Nos);
ZTopOrdinarySegment = repmat(0,1,(NumberStory)*Nos);
XBottomOrdinarySegment = XTopOrdinarySegment;
ii = 0;
jj = 0;
for i = 1:NumberBay
    for k = 1:Nos
        ii = ii+1;
        XTopOrdinarySegment(ii) = los*k*i;
        XBottomOrdinarySegment(ii) = los*k*i;
    end
end
for j = 1:NumberStory
    for k = 1:Nos
        jj = jj+1;
        ZTopOrdinarySegment(jj) = H*(j);
        ZBottomOrdinarySegment(jj) = (H*(j)-h(1));
    end
end
X = [XTopOrdinarySegment,XBottomOrdinarySegment]
Z = [ZTopOrdinarySegment,ZBottomOrdinarySegment]
scatter(X,Z,'filled'),grid on

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Answer 1

Voss 2024-4-10

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2105211-how-to-scatter-plot#answer_1439476

编辑：Voss 2024-4-10

"It is because my X is a 1x16 double and my Z is a 1x32 double."

That's true. That is the problem.

"When i do [X1,X2], it just reads X1 because X1 and X2 has same value in each variable."

No. The problem has nothing to do with X1 and X2 being the same.

The problem is your X are half as long as your Z. That is because Nb=1 and Ns=2.

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Voss 2024-4-10

在 MATLAB Online 中打开

Maybe you want to plot a replicated version of the X vector, where it is replicated as many times as it takes (Ns/Nb) to be the same length as the Z vector.

See below for one way to do that. Also, I've replaced all your for loops operating on one element at a time with equivalent vectorized operations.

clear;

clc;

H = 5;

L = 15;

Ns = 2;

Nb = 1;

PortalHeight = H;

Bayspan = L;

NumberStory = Ns;

NumberBay = Nb;

%Variable1

h = [0.8,1.00,1.20,1.40,1.6,1.80];

%Variable2

Lss = [2.00,2.40,2.80,3.20,3.60,4.00];

%Variable3

Nss = [2,3,4];

Var1HeightTrussBeam = h;

Var2LengthSpecialSegment = Lss;

Var3NumberSpecialSegment = Nss;

%% XZ Column

Xcolumn = L*(0:NumberBay);

Xbotbeam = L*(0:NumberBay);

Zcolumn = H*(0:NumberStory);

Zbotbeam = H*(0:NumberStory)-h(1);

Zbotbeam = Zbotbeam(1,[Ns,Ns+1]);

%calculate segment length of ordinary segment

Los = (L-Lss(1))/2;

Nos = Los/h(1);

Nos = round(Nos);

los = Los/Nos;

checkspan = logical(los*Nos*2+Lss(1)==15)

checkspan = logical

1

assert(logical(los*Nos*2+Lss(1)==15),"span must be 15m");

%% 1st Story

%XZ first top and bottom ordinary segment(os)

XTopOrdinarySegment = reshape(los*(1:Nos).'.*(1:NumberBay),1,[]);

XBottomOrdinarySegment = XTopOrdinarySegment;

ZTopOrdinarySegment = repelem(H*(1:NumberStory),1,Nos);

ZBottomOrdinarySegment = repelem(H*(1:NumberStory)-h(1),1,Nos);

% replicate [X1,X2] to be the same size as [Z1,Z2] for plotting:

X = repmat([XTopOrdinarySegment,XBottomOrdinarySegment],1,Ns/Nb);

Z = [ZTopOrdinarySegment,ZBottomOrdinarySegment];

scatter(X,Z,'filled'),grid on

Arif 2024-4-12

Thanks buddy

Voss 2024-4-12

You're welcome!

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How to scatter plot

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