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<p>Hello,</p>
<p>The matrix exponential is defined as</p>
<p>expm(A)=I+A+1/2*A^2+...+1/k!*A^k+...</p>
<p>where the "*" denotes the matrix product.</p>
<p>You can obtain what you wanted with <br>
</p>
<p>exp(A)<br>
</p>
i.e. element-wise exponential of A<br>
<br>
S.<br>
<br>
<div class="moz-cite-prefix">Le 02/02/2017 à 09:49, Jean Rubagenga a
écrit :<br>
</div>
<blockquote
cite="mid:CALTEAJiV_zzHYmT4=zNOSuQudwf3NoHsk6vaZruOHJ1mL0PwYg@mail.gmail.com"
type="cite">
<div dir="ltr">Hi,
<div><br>
</div>
<div>I am trying to use expm() and do not get what I am
expecting.</div>
<div><br>
</div>
<div>I enter A = [1,0.5,0.7;0.3,0.7,1;1,0,1]</div>
<div>and B = expm(A)</div>
<div>and get as result</div>
<div><br>
</div>
<div>B = </div>
<p class="MsoNormal"><span
style="font-size:16pt;line-height:107%"> 4.1672519
1.3854159 2.8881517 <span></span></span></p>
<p class="MsoNormal"><span
style="font-size:16pt;line-height:107%"> 2.1672628
2.4007931 3.0513947 <span></span></span></p>
<div><span style="font-size:16pt"> </span><span
style="font-size:16pt">3.1716359</span><span
style="font-size:16pt">
</span><span style="font-size:16pt">0.6680066</span><span
style="font-size:16pt"> </span><span
style="font-size:16pt">3.96685</span>.</div>
<div><br>
</div>
<div>I expected the matrix B elements to be exponents of
corresponding elements of matrix A. For example</div>
<div>B(1,1) = B(2,3) = B(3,1) = B(3,3) = <span
style="font-size:16pt">2.7182818</span></div>
<div><span style="font-size:16pt"><br>
</span></div>
<div><span style="font-size:16pt">Could you please explain to me
what is going on?</span></div>
<div><span style="font-size:16pt"><br>
</span></div>
<div><span style="font-size:16pt">Thanks</span></div>
<div><span style="font-size:16pt"><br>
</span></div>
<div><span style="font-size:16pt">Jean</span></div>
<div><span style="font-size:16pt"><br>
</span></div>
<div><span style="font-size:16pt"><br>
</span></div>
<p class="MsoNormal"><span
style="font-size:16pt;line-height:107%"><span></span></span></p>
</div>
<br>
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<br>
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