Syntax of semilogx, semilogy, loglog

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Nicolas
Nicolas 2011-9-26
评论： Steven Lord 2020-6-23
Hi,
I just realized that the following syntaxes are not valid
semilogx(X1,Y1,LineSpec,'PropertyName',PropertyValue)
semilogy(X1,Y1,LineSpec,'PropertyName',PropertyValue)
loglog(X1,Y1,LineSpec,'PropertyName',PropertyValue)
whereas
plot(X1,Y1,LineSpec,'PropertyName',PropertyValue)
is valid. Shouldn't this be fixed for consistency?

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Wayne King
Wayne King 2011-9-26
Hi Nicolas, Can you give an example?
x = logspace(-1,2);
loglog(x,exp(x),'-s','linewidth',2)
figure;
x = 0:0.1:10;
semilogx(10.^x,x,'r--','linewidth',2)
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Nicolas
Nicolas 2011-9-26
On the other hand for plot it sais:
Syntax
plot(Y)
plot(X1,Y1,...,Xn,Yn)
plot(X1,Y1,LineSpec,...,Xn,Yn,LineSpec)
plot(X1,Y1,LineSpec,'PropertyName',PropertyValue)
plot(axes_handle,X1,Y1,LineSpec,'PropertyName',PropertyValue)
h = plot(X1,Y1,LineSpec,'PropertyName',PropertyValue)
Guess I wasn't interpreting the ... properly.
Wayne King
Wayne King 2011-9-26
Right:
loglog(X1,Y1,LineSpec,....)
means:
x = logspace(-1,2);
loglog(x,exp(x),'-or')
or some other valid linespec (the 'or' is a linespec)
loglog(...,'PropertyName',PropertyValue,...)
means:
loglog(x,exp(x),'linewidth',2,'LineStyle','-.');
or some valid 'PropertyName',PropertyValue combination.
Glad it's working!

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更多回答（2 个）

UJJWAL
UJJWAL 2011-9-26
Things are working ok... There is no inconsistency or I was not able to understand you.. Please check the following code and rephrase the question so that I would understand better :-
clc
clear all
t= 0:0.001:2;
plot(t,exp(t),'--.r','LineWidth',2);
figure(2);
semilogx(t,exp(t),'*k','LineWidth',2);
figure(3);
semilogy(t,exp(t),'-.b','LineWidth',2);
figure(4);
loglog(t,exp(t),'--y','LineWidth',2);
Khaleel UR Rehman Khan
If suppose we have to make the linewidth=3,
loglog(x,y,'linewidth',3) is wrong
the right syntax is
loglog(x,y,"Linewidth",3)
  1 个评论
Steven Lord
Steven Lord 2020-6-23
loglog accepts the name of a name-value pair argument as a char vector or as a string perfectly fine when I tried it in release R2020a. Can you clarify why you believe the syntax with the name specified as a char vector is wrong? If you're seeing an error can you show all of the error message (all the text displayed in red?)
x = 1:10;
y = x.^2;
figure
loglog(x, y, 'linewidth', 3)
figure
loglog(x, y, "linewidth", 3)

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