Asking about an output

1 次查看（过去 30 天）
Ritesh Khan
Ritesh Khan 2020-3-26
编辑： Stephen23 2020-3-26
%% Differentiation of tan^{-1}x at 1
clear all;
clc;
f=@(x) atan(x);
a=1;
h=10.^[-2:-1:-4];
eVal=1/(1+a^2);
%% Forward difference formula
errf=zeros(length(h),1);
for i=1:length(h)
fDiff(i)=(f(a+h(i))-f(a))/h(i);
errf(i)=abs(eVal-fDiff(i));
end
disp(errf);
%% Central difference formula
errc=zeros(length(h),1);
for i=1:length(h)
fCen(i)=(f(a+h(i))-f(a-h(i)))/(2*h(i));
errc(i)=abs(eVal-fCen(i));
end
disp(errc);
%% Backward Difference formula
errb=zeros(length(h),1);
for i=1:length(h)
fBack(i)=(f(a)-f(a-h(i)))/h(i);
errb(i)=abs(eVal-fBack(i));
end
disp(errb);
The output is:
0.002491666914583
0.000249916666750
0.000024999166126
1.0e-05 *
0.833308332937044
0.008333328516130
0.000083316731292
0.002508333081242
0.000250083333320
0.000025000832460
My question is why the term 1.0e-05 * appearing?

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采纳的回答

Stephen23
Stephen23 2020-3-26
编辑：Stephen23 2020-3-26
"My question is why the term 1.0e-05 * appearing?"
Because you are displaying the values in the command window using long format. Change the format if you want to display the numbers using another format, e.g.:
>> format long
>> errc
errc =
1.0e-05 *
0.833308332937044
0.008333328516130
0.000083316731292
>> format long G
>> errc
errc =
8.33308332937044e-06
8.33332851613022e-08
8.33167312919159e-10
>> format short
>> errc
errc =
1.0e-05 *
0.8333
0.0083
0.0001
etc. If you want more format control than those offer then use fprintf.

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