Error in color linetype argument

Please help me, I am trying to run this code: function perf(T,logplot) if (nargin< 2) logplot = 0; end colors = ['m''b''r''g''c''k''y']; lines = ['-''-''-.''--']; markers = ['x''x'...

Chieu Nguyen

Please help me, I am trying to run this code:

function perf(T,logplot)

if (nargin< 2) logplot = 0; end

colors = [‘m»b»r»g»c»k»y’];

lines = [‘-»-»-.»—‘];

markers = [‘x»x»x»x»v»^»o’];

[np,ns] = size(T);

minperf = min(T,[],2);

r = zeros(np,ns);

for p = 1: np

r(p,:) = T(p,:)/minperf(p);

end

if (logplot) r = log2(r); end

max_ratio = max(max(r));

r(find(isnan(r))) = 2*max_ratio;

r = sort(r);

clf;

for s = 1: ns

[xs,ys] = stairs(r(:,s),[1:np]/np);

option = [‘-‘ colors(s) markers(s) ];

plot(xs,ys,option,‘MarkerSize’,3);

hold on;

end

axis([ 0.1 1.1*max_ratio 0 1 ]);

When I running, it appears error:

perf(T,2)

Error using plot Error in color/linetype argument.

Error in perf (line 20) plot(xs,ys,option,’MarkerSize’,3);

If someone knows the answer, please help me.

Accepted Answer

Walter Roberson

lines = [‘-»-»-.»—‘];

creates a character vector that contains -‘-‘-.’—

You need to learn how to use cell arrays of character vectors.


More Answers (2)

Steven Lord

Depending on the release you’re using, I recommend using string arrays instead.

colors = [«m», «b», «r», «g», «c», «k», «y»];

lines = [«-«, «-«, «-.», «—«];

markers = [«x», «x», «x», «x», «v», «^», «o»];

plot(1:10, 1:10, colors(3)+lines(4)+markers(5))

Note that this is different from concatenating the strings together using [], which will not work.

doesNotWork = plot(1:10, 1:10, [colors(3),lines(4),markers(5)])

Using + to combine the three scalar string arrays makes a new scalar string whose contents are the contents of the shorter strings concatenated, while using [] makes a larger string array each element of which is one of the original strings. The two string arrays works and doesNotWork defined below look different and have different sizes.

works = colors(3)+lines(4)+markers(5)

doesNotWork = [colors(3), lines(4), markers(5)]

whos works doesNotWork

kaushik gupta

clc;

clf;

close all;

clear all;

x1=(‘Enter the sequence x:’);

g=x1(end:-1:1);

i=length(x1);

j=length(g);

cov=zeros(1,i+j-1);

for k=i;

for i=j;

cov(k+i-1)=cov(k+i-1)+x1(k)*g(i);

end;

end;

m=0:length(x1)-1;

subplot(2,1,1);

stem(m,x1);

grid on;

axis([-1 length(cov) min(cov)-2 max(cov)+2]);

xlabel(‘…’);

ylabel(‘original sequence’);

title(‘Autocorrelation’);

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Matlab’s plot command

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    MathematicalPhysicist

  • Start date
    Nov 30, 2017

  • Nov 30, 2017

  • #1
I am using Matlab’s 2017Rb academic license.

And while trying to operate the following sequence of commands:

x = linspace(0,2*pi,1000);
y = sin(2*x);
plot(x,y,'k−','linew',2); hold on;

I get the following warning:

Error using plot
Error in color/linetype argument.

What seems to be wrong in the above code?

Thanks.

Answers and Replies

  • Nov 30, 2017

  • #2

  • Nov 30, 2017

  • #3
So the error is in ‘k-‘, how it should be?
‘-k’, yes now it works.

  • Nov 30, 2017

  • #4
So the error is in ‘k-‘, how it should be?
‘-k’, yes now it works.

But… ‘-k’ make the same as ‘k’ I think…

  • Nov 30, 2017

  • #5
So the error is in ‘k-‘, how it should be?
‘-k’, yes now it works.

Interesting. The documentation says that the order of the symbols doesn’t matter. So this is either a bug or there is something else going on.

  • Dec 1, 2017

  • #6
Interesting. The documentation says that the order of the symbols doesn’t matter. So this is either a bug or there is something else going on.

Did you try it in your machine?

I have Ubuntu 16.04 as the OS in this computer.

  • Dec 1, 2017

  • #7
But… ‘-k’ make the same as ‘k’ I think…

Yes, it works as well.

  • Dec 1, 2017

  • #8

And… Why were you trying to plot ‘k-‘?

  • Dec 1, 2017

  • #9
And… Why were you trying to plot ‘k-‘?

I copy-paste this snippet of code from some lecture notes I am reading.

So there I had this ‘k-‘.

  • Dec 1, 2017

  • #10
Did you try it in your machine?

I have Ubuntu 16.04 as the OS in this computer.

I’m retired and no longer have access to MATLAB. I’m thinking about buying it just for these occasions.

  • Dec 7, 2017

  • #11
It’s not a bug. And the order doesn’t matter. The problem is you don’t have a dash in there. It’s some character that looks like a dash but isn’t. When I paste in your code it shows the error message

Error using plot
Error in color/linetype argument.
Error in test1 (line 3)
plot(x,y,’k?’,’linew’,2);

See the question mark indicating it doesn’t know what that character is? If you get rid of that «dash» and replace it with a real dash (minus sign), it will work perfectly fine.

  • Dec 7, 2017

  • #12
It’s not a bug. And the order doesn’t matter. The problem is you don’t have a dash in there. It’s some character that looks like a dash but isn’t. When I paste in your code it shows the error message

Error using plot
Error in color/linetype argument.
Error in test1 (line 3)
plot(x,y,’k?’,’linew’,2);

See the question mark indicating it doesn’t know what that character is? If you get rid of that «dash» and replace it with a real dash (minus sign), it will work perfectly fine.

Good catch! This is one of the frustrating things about copying and pasting text — they can have characters and do other things you don’t want. I like to paste into a programmer editor that I can control, like vim, just to be sure that the text is exactly what I wanted. I often have to replace things that I don’t want in code. Then I copy the vim text and paste that into the target code.

Suggested for: Matlab’s plot command

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When running code it returns >> pp01 Error using plot Error in color/linetype argument. Error in pp01 (line 33) plot(t(:),​z(:,1),’W’​,t(:),z(:,​2),’F’)

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  • b: blue
  • c: cyan
  • d: diamond marker
  • g: green
  • h: hexagon marker
  • k: black
  • m: magenta
  • o: circle marker
  • p: pentagram marker
  • r: red
  • s: square marker
  • v: down triangle marker
  • w: white
  • x: x marker
  • y: yellow
  • * : * marker
  • +: + marker
  • . : dot marker
  • ^: upward triangle marker
  • >: right triangle marker
  • — and : are used for line styles
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Error in color/linetype argument when using errorbar

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Matlab’s plot command

I am using Matlab’s 2017Rb academic license.

And while trying to operate the following sequence of commands:

What seems to be wrong in the above code?

Answers and Replies

Check this Matlab plot command page. The examples show some args:

Did you try it in your machine?

I have Ubuntu 16.04 as the OS in this computer.

I copy-paste this snippet of code from some lecture notes I am reading.

So there I had this ‘k-‘.

Did you try it in your machine?

I have Ubuntu 16.04 as the OS in this computer.

It’s not a bug. And the order doesn’t matter. The problem is you don’t have a dash in there. It’s some character that looks like a dash but isn’t. When I paste in your code it shows the error message

Error using plot
Error in color/linetype argument.
Error in test1 (line 3)
plot(x,y,’k?’,’linew’,2);

See the question mark indicating it doesn’t know what that character is? If you get rid of that «dash» and replace it with a real dash (minus sign), it will work perfectly fine.

It’s not a bug. And the order doesn’t matter. The problem is you don’t have a dash in there. It’s some character that looks like a dash but isn’t. When I paste in your code it shows the error message

Error using plot
Error in color/linetype argument.
Error in test1 (line 3)
plot(x,y,’k?’,’linew’,2);

See the question mark indicating it doesn’t know what that character is? If you get rid of that «dash» and replace it with a real dash (minus sign), it will work perfectly fine.

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When running code it returns >> pp01 Error using plot Error in color/linetype argument. Error in pp01 (line 33) plot(t(:),​z(:,1),’W’​,t(:),z(:,​2),’F’)

Lucy Raistrick

function pp01

clear

global As Qt g A c

As=15;

Qt=10;

g=9.81;

A=(121/64)*pi;

c=0.02;

z1_initial=10;

z2_initial=25;

N=1000;

h=0.5;

t=zeros(N,1);

z=zeros(N,2);

t(1)=0;

z(1,1)=z1_initial;

z(1,2)=z2_initial;

for n=1:N-1

t(n+1)=t(n)+h;

z(n+1,:)=z(n,:)+h*f(t(n),z(n,:));

z(n+1,:)=z(n,:)+0.5*h*(f(t(n),z(n,:))+f(t(n+1),z(n+1,:)));

end

%plot(t(:),z(:,1),’W’,t(:),z(:,2),’F’)

Figure 2

Plot(z(:,1),z(:,2))

[t,z];

return

function dzdt=f(~,z)

global As Qt g A c

%dzdt(1)=z(2);

%dzdt(2)=-z(1);

dzdt(1)=(1/As)*(z(2)-Qt);

dzdt(2)=-g*(A/2)*(z(1)+(c*abs(z(2))*z(2)));

return


回答（1 个）

Walter Roberson

‘W’ is valid as a code for White but ‘F’ is not a color abbreviation and is not a marker shape code. Valid codes are

  • b: blue
  • c: cyan
  • d: diamond marker
  • g: green
  • h: hexagon marker
  • k: black
  • m: magenta
  • o: circle marker
  • p: pentagram marker
  • r: red
  • s: square marker
  • v: down triangle marker
  • w: white
  • x: x marker
  • y: yellow
  • *: * marker
  • +: + marker
  • . : dot marker
  • ^: upward triangle marker
  • <: left triangle marker
  • >: right triangle marker
  • — and : are used for line styles

另请参阅

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Hi,

I would like to plot several lines together using plot3, each line having
its own color specification. I know that this can somehow be done using the
syntax

plot3(Xcoords, Ycoords, Zcoords, Linespecs)

in which the above four arguments are vectors or matrices, but my problem
is that I do not know how to construct the Linespecs matrix/vector.

For example,

plot3([1,3; 1,3], [2,4; 2,4], [0,0; 1,1])

is OK, bit if I try

plot3([1,3; 1,3], [2,4; 2,4], [0,0; 1,1], [[‘Color’,[1,0,0]],
[‘Color’,[1,0,1]]])

I get the error message «Error in color/linetype argument». What is
the
correct way of constructing the matrix/vector of line specifications please?

Many thanks,

Richard

——————————-
Richard Dybowski, 143 Village Way, Pinner, Middlesex HA5 5AA, UK
Tel (mobile): 079 76 25 00 92

Reply by ●September 4, 20012001-09-04

hello,

one way of doing this is the following.
ues

h = plot3([1,3; 1,3], [2,4; 2,4], [0,0; 1,1]);

h is now a 2 by 1 vector containing hadles to the line objects, you can now
type

set(h,’color’,[0 1 0])

or if you want to change each line seperatly
set(h(1),’color’,[0 1 0]) ,etc.

get(h(1))
shows all the parameters of the object h(1) (the line in this case) that
can be varied.

Hope this helps

Mark Hunter.
At 15:24 4/09/2001 +0100, Richard Dybowski wrote:
>Hi,
>
>I would like to plot several lines together using plot3, each line having
>its own color specification. I know that this can somehow be done using
the
>syntax
>
>plot3(Xcoords, Ycoords, Zcoords, Linespecs)
>
>in which the above four arguments are vectors or matrices, but my problem
>is that I do not know how to construct the Linespecs matrix/vector.
>
>For example,
>
>plot3([1,3; 1,3], [2,4; 2,4], [0,0; 1,1])
>
>is OK, bit if I try
>
>plot3([1,3; 1,3], [2,4; 2,4], [0,0; 1,1], [[‘Color’,[1,0,0]],
>[‘Color’,[1,0,1]]])
>
>I get the error message «Error in color/linetype argument». What
is the
>correct way of constructing the matrix/vector of line specifications
please?
>
>Many thanks,
>
>Richard
>
>——————————-
>Richard Dybowski, 143 Village Way, Pinner, Middlesex HA5 5AA, UK
>Tel (mobile): 079 76 25 00 92
>
>
>_____________________________________
>Note: If you do a simple «reply» with your email client, only the
author
>of this message will receive your answer. You need to do a «reply
all» if
>you want your answer to be distributed to the entire group.
>
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>»>http://docs.yahoo.com/info/terms/

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Problem with plotting with string of different color names

Problem with plotting with string of different color names

(OP)

18 Dec 02 04:22

Hello,

I am having problem with using different colors base on the the various cmd in the for loop. I apply the suggested solution provided in one of the past threads but I am not able to get the result. I don’t understand what the error message is reporting. Can someone help me? Many Thanks in advance.

C=[‘r.’ ‘g.’ ‘b.’ ‘c.’];
for ht = 0:(num-1)
  for cmd = 1:4,
        idx = (find(new_h == ht & new_cmd == cmd));
        [r] = ind2sub(idx, [idx]);
        chs = [new_cmd, new_c, new_s];
        cmdgroup = chs([r],:);
        c = cmdgroup(:,2);
        s = cmdgroup(:,3);
        cmd = cmdgroup(:,1);
        plot(c, s, C(cmd));
        axis ([-5000 40000 -100 900]);
        hold on;
  end;
end;

======================================================
Error message :

??? Error in color/linetype argument

On line 49  ==>     plot(c, s, C(cmd));

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