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how to combain matrix with vector

2 次查看（过去 30 天）
nadav regev
nadav regev 2017-12-12
关闭： MATLAB Answer Bot 2021-8-20
if I have matrix a = [9 8 7; 6 5 4] and vector v = [1 2 3 4 5] I want to combaine matrix like this
[9 8 7 inf inf; ...
6 5 4 inf inf; ...
1 2 3 4 5]
thank you!!

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回答（3 个）

KL
KL 2017-12-12
编辑：KL 2017-12-12
Something like this?
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
sz = size(a);
a = [a inf(sz(1),size(v,2)-sz(2));v]
  4 个评论
显示 2更早的评论
KL
KL 2017-12-12
编辑：KL 2017-12-12
I agree with Jan.
@Birdman: Usually when you see a homework, doit4me tag (tagged by volunteers), you could choose not to answer or you could give them some hints rather than explicit answers.
For example the one on the below link was clearly a copy-paste of homework question, a typical doit4me.
https://de.mathworks.com/matlabcentral/answers/372543-i-got-it-thank-you
Steven Lord
Steven Lord 2017-12-12
And if it sounds like it may be homework but you're not certain, you can gently nudge the poster into offering more information. I tend to use something like "If you show us what you've already tried we may be able to offer some suggestions for how to proceed." to do that nudging.
Andrei Bobrov
Andrei Bobrov 2017-12-12
编辑：Andrei Bobrov 2017-12-12
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
z = {a;v};
[ii,jj] = cellfun(@size,z);
n = max(jj);
out = cell2mat(arrayfun(@(x,y,k)[z{x},inf(k,n - y)],(1:numel(z))',jj,ii,'un',0))
or
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
z = {a;v};
m = numel(z);
[ii,jj] = cellfun(@size,z);
n = max(jj);
i2 = cumsum(ii);
i1 = i2 - ii + 1;
out = inf(sum(ii),n);
for ii = 1:m
out(i1(ii):i2(ii),1:jj(ii)) = z{ii};
end
  1 个评论
Birdman
Birdman 2017-12-12
Please do not provide direct solutions before seeing any effort from the user.
Jan
Jan 2017-12-12
编辑：Jan 2017-12-12
FEX: padcat:
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
out = padcat(a(1, :), a(2, :), v);
out(isnan(out)) = Inf;
Or write a function by your own:
% UNTESTED !!!
function Out = CatPadding(Dim, varargin)
In = varargin;
S1 = cellfun('size', In, 1);
S2 = cellfun('size', In, 2);
c = 1;
if Dim == 1
Out = Inf(sum(S1), max(S2));
for k = 1:numel(In)
Out(c:c+S1(k)-1, 1:S2(k)) = In{k};
c = c + S1(k);
end
elseif Dim == 2
Out = Inf(max(S1), sum(S2));
for k = 1:numel(In)
Out(1:S1(k), c:c+S2(k)-1) = In{k};
c = c + S2(k);
end
else
error('Only Dim=1 and Dim=2 implemented yet.')
end
And:
a = [9 8 7; 6 5 4];
v = [1 2 3 4 5];
Out = CatPadding(1, a, v)

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