(i) x-and-y scales defined as "log", or (ii) calculate the log of variables, or (iii) loglog

Question

Sim 2023-5-9

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评论： Sim 2023-5-12

采纳的回答： VBBV

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Are these three methods (and the corresponding plots) equivalent ways to perform the same task ?

% Method 1

figure

axes('XScale', 'log', 'YScale', 'log')

plot(1:10, 1:10)

title('plot(1:10, 1:10), with both x-and-y scales defined as "log"')

% Method 2

figure

plot(log(1:10), log(1:10))

title('plot(log(1:10), log(1:10))')

% Method 3

figure

loglog(1:10, 1:10)

title('loglog(1:10, 1:10)')

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Answer 1

VBBV 2023-5-9

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% Method 1

figure

plot(1:10, 1:10)

ax = gca;

% put this after plot call and use as below

set(ax,'XScale', 'log', 'YScale', 'log')

title('plot(1:10, 1:10), with both x-and-y scales defined as "log"')

% Method 2 -->>>> Linear scale but log values of inputs

figure

plot(log(1:10), log(1:10))

title('plot(log(1:10), log(1:10))')

% Method 3

figure

loglog(1:10, 1:10)

title('loglog(1:10, 1:10)')

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VBBV 2023-5-9

编辑：VBBV 2023-5-9

Method 1 and Method 3 are equivalent but Method 2 is not same as remaining two methods, since Method 2 plots the logarithm of input values on linear scale , while Method 1 uses log scale for plotting linear values, and Method 3 also does same

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Answer 2

Antoni Garcia-Herreros 2023-5-9

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No,

Method 1 and 3 are equivalent. The X and Y values range from 1 to 10, it does not matter which scale you use, the values remain the same.

% Method 1
subplot(1,3,1)
plot(1:10, 1:10)
title('plot(1:10, 1:10), with both x-and-y scales defined as "log"')
ax=gca;
ax.XScale= 'log'; ax.YScale = 'log';
title('Method 1')
% Method 3
subplot(1,3,3)
loglog(1:10, 1:10)
title('Method 3')